Document and Entity Information Accrued Clinical Expenses, Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for clinical studies, which covers fees paid to CROs, investigative sites in connection with clinical studies and contract manufacturers in connection with the production of clinical study materials; and fees paid to vendors in connection with the preclinical development activities. Accrued clinical expenses Interest expense Interest and Other Expense Represents the amount of interest expense and other expense recognized during the period. Included in this element is the cost of borrowed funds accounted for as interest that was charged against earnings during the period and other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. Interest and other expense Mark to Market Adjustment of Warrant Liability Mark-to-market adjustment of warrant liability This element represents adjustments related to net changes in the market value of warrant liability. Unrealized Gain (Loss) on Conversion of Debt to Stock Beneficial conversion features Amount of unrealized gain (loss) for the period from the increase (decrease) in fair value on conversion of convertible debt into convertible preferred stock. Debt may include promissory note, bridge loan etc. Beneficial conversion features Stock Issued During Period Value Founders for Service Equity impact of the value of new stock issued to founders in exchange for service during the period. Issuance of common stock to founders for service Stock Issued During Period Shares Founders for Service Number of new stock issued to founders in exchange for service during the period. Issuance of common stock to founders for service (in shares) Stock Issued During Period Value New Preferred Stock Issues for Service Issuance of convertible preferred stock in exchange for service Equity impact of the value of new series A convertible preferred stock issued in exchange for service during the period. Issuance of convertible preferred stock in exchange for service at $1.47 per share Stock Issued During Period Shares New Preferred Stock Issues for Service Number of new series A convertible preferred stock issued in exchange for service during the period. Issuance of convertible preferred stock in exchange for service (in shares) Adjustments to Additional Paid in Capital for Reclass of Early Exercise of Stock Options to Liability Adjustment to additional paid-in-capital resulting from reclassification of early exercise of stock options to liability. Reclass of early exercise of stock options liability Reclass of early exercise of stock options liability Amendment Description Reclass of Early Exercise of Stock Options to Liability Shares Reclass of early exercise of stock options liability (in shares) Reclass of early exercise of stock options liability (in shares) Reduction in number of common stock resulting from reclassification of early exercise of stock options to liability. Amendment Flag Adjustments to Additional Paid in Capital for Release of Early Exercise of Stock Options Liability Adjustment to additional paid-in-capital resulting from release of early exercise of stock options liability. Release of early exercise of stock options liability Release of Early Exercise of Stock Options Liability Shares Increase in number of common stock resulting from release of early exercise of stock options liability. Release of early exercise of stock options liability (in shares) Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities and Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Change in other comprehensive loss-unrealized loss on investments and foreign currency translation Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. It also includes change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. Stock Issued During Period Value New Preferred Stock Issues For Licensed Technology Equity impact of the value of new convertible preferred stock issued in exchange for licensed technology during the period. Issuance of convertible preferred stock in exchange for licensed technology at $7.28 per share Issuance of convertible preferred stock in exchange for licensed technology Stock Issued During Period Shares New Preferred Stock Issues for Licensed Technology Number of new convertible preferred stock issued in exchange for licensed technology during the period. Issuance of convertible preferred stock in exchange for licensed technology (in shares) Adjustments to Additional Paid in Capital Beneficial Conversion Feature Adjustment to additional paid-in-capital resulting from beneficial conversion feature related to conversion of convertible promissory notes into convertible preferred stock. Beneficial conversion feature related to conversion of convertible promissory notes into convertible preferred stock Stock Issued During Period Value for Service Equity impact of the value of new stock issued in exchange for service during the period. Issuance of common stock for service Stock Issued During Period Shares for Service Number of new stock issued in exchange for service during the period. Issuance of common stock for service (in shares) Stock Repurchased During Period Value Upon Employee Termination Equity impact of the value of stock that has been repurchased upon employee termination during the period. Repurchase of common stock upon employee termination Repurchase of common stock upon employee termination Stock Repurchased During Period Shares Upon Employee Termination Number of shares that have been repurchased upon employee termination during the period. Repurchase of common stock upon employee termination (in shares) Repurchase of common stock upon employee termination (in shares) Stock Issued During Period Value in Lieu of Interest Payment Equity impact of the value of new stock issued in lieu of interest payment during the period. Issuance of Series B-2 convertible preferred stock in lieu of interest payment at $5.46 per share Issuance of Series B-2 convertible preferred stock in lieu of interest payment at $5.46 per share Stock Issued During Period Shares in Lieu of Interest Payment Number of new stock issued in lieu of interest payment during the period. Issuance of Series B-2 convertible preferred stock in lieu of interest payment (in shares) Adjustments to Additional Paid in Capital Issuance of Warrants in Connection with Issuance Convertible Preferred Stock Adjustment to additional paid-in-capital resulting from issuance of warrants in connection with issuance of convertible preferred stock. Issuance of warrants in connection with issuance of Series B-2 convertible preferred stock Stock Issued During Period Value Conversion of Convertible Preferred Stock to Common Stock The net amount of stock issued during the period upon conversion of convertible preferred stock to common stock. Conversion of convertible preferred stock to common stock at a ratio of 1:1 Number of common shares issued during the period as a result of conversion of convertible preferred stock. Conversion of convertible preferred stock to common stock at a ratio of 1:1 (in shares) Stock Issued During Period Shares Conversion of Convertible Preferred Stock to Common Stock Stock Issued During Period Value New Upon Release of Escrow Funds Equity impact of the value of common stock issued upon release of escrow funds during the period. Issuance of common stock upon release of escrow funds Current Fiscal Year End Date Stock Issued During Period Shares New Upon Release of Escrow Funds Number of common stock issued upon release of escrow funds during the period. Issuance of common stock upon release of escrow funds (in shares) Stock Issued During Period Value New Collaborator Equity impact of the value of common stock issued to collaborator in lieu of milestone payments during the period. Issuance of common stock to collaborator in lieu of milestone payment Stock Issued During Period Shares New Collaborator Number of common stock issued to collaborator in lieu of milestone payments during the period. Issuance of common stock to collaborator in lieu of milestone payment (in shares) Stock Issued During Period Value New Upon Exercise of Overallotment by Underwriters Equity impact of the value of common stock issued upon exercise of overallotment by underwriters during the period. Issuance of common stock upon exercise of overallotment by underwriters net of issuance cost of $17,291 Issuance of common stock upon exercise of overallotment by underwriters net of issuance cost of $17,291 Stock Issued During Period Shares New Upon Exercise of Overallotment by Underwriters Number of common stock Issued upon exercise of overallotment by underwriters during the period. Issuance of common stock upon exercise of overallotment by underwriters net of issuance cost (in shares) Stock Issued During Period Value New Upon Private Placement Equity impact of the value of common stock issued upon private placement transaction during the period. Issuance of common stock upon private placement transaction, net of issuance cost of $508,384 Stock Issued During Period Shares New Upon Private Placement Number of common stock Issued upon private placement transaction during the period. Issuance of common stock upon private placement transaction, net of issuance cost (in shares) Adjustments to Additional Paid in Capital Private Placement Transaction Represents the change in additional paid-in-capital resulting from issuance of warrants in conjunction with private placement transaction. Issuance of warrants in conjunction with private placement transaction Stock Issued During Period Value New Upon Early Exercise of Stock Options and Liability Equity impact of the value of common stock issued upon early exercise of stock options and liability during the period. Net change of early exercise of stock options and liability Stock Issued During Period Shares New Upon Early Exercise of Stock Options and Liability Number of common stock Issued upon early exercise of stock options and liability during the period. Net change of early exercise of stock options and liability (in shares) Adjustments to Additional Paid in Capital for Reclassification of Liability to Equity Represents the change in additional paid-in-capital resulting from reclassification of warrant and derivative liability to equity during the period. Reclass of warrant and derivative liability to equity in conjunction with conversion of convertible promissory notes into common stock Document Period End Date Issuance of common stock upon exercise of warrants Value stock issued during the period as a result of the exercise of warrants. Stock Issued During Period Value Warrants Exercised Stock Issued During Period Shares Warrants Exercised Number of warrants exercised during the current period. Issuance of common stock upon exercise of warrants (in shares) Adjustments to Additional Paid in Capital Share Based Compensation Equity Awards This element represents the amount of recognized equity-based compensation related to equity awards during the period. Share-based compensation related to equity awards Issuance of common stock upon cashless exercise of warrants (in shares) This element represent Number of cashless warrants exercised during the current period. Stock Issued During Period Shares Warrants Exercised Cashless Stock Issued During Period Shares Founders for Cash Number of new stock issued to founders for cash during the period. Issuance of common stock to founders for cash (in shares) Adjustments To Additional Paid in Capital, Share Based Compensation, Stock Options, Requisite Service Period, Recognition To Consultants This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized) to consultants. Remove LineStock-based compensation expense related to consultant options The net amount of stock issued during the period upon the conversion of convertible securities, net of adjustments. Stock Issued During Period Value Conversion Of Convertible Securities Net Of Adjustment Issuance of stock upon conversion of convertible promissory notes Stock Issued During Period Value Preferred Stock Issues For Licensed Technology Issuance of convertible preferred stock in exchange for licensed technology Equity impact of the value of new convertible preferred stock issued in exchange for licensed technology during the period. Stock Issued During Period Shares Preferred Stock Issues For Licensed Technology Issuance of convertible preferred stock in exchange for licensed technology (in shares) Series A-2 Preferred Stock [Member] Series A-2 Convertible Preferred Stock Represents Outstanding nonredeemable series A-2 preferred stock or outstanding series A-2 preferred stock. Series B-2 Preferred Stock [Member] Series B-2 Convertible Preferred Stock Represents Outstanding nonredeemable series B-2 preferred stock or outstanding series B-2 preferred stock. Equity Issuance Dollar Amount Per Share For Interest Payment The amount per share assigned to the consideration received for equity securities issued by a development stage enterprise during a specific stock issuance in lieu of interest payment since its inception. Issuance of stock in lieu of interest payment, per share (in dollars per share) Equity Component Conversion Ratio, Numerator Numerator for the convertible stock conversion ratio Represents the numerator for calculating the ratio of equity securities to be converted. Equity Component Conversion Ratio, Denominator Denominator for the convertible stock conversion ratio Represents the denominator for calculating the ratio of equity securities to be converted. Issuance of Common Stock upon Exercise of Overallotment by Underwriters, Issuance Cost Issuance of common stock upon exercise of overallotment by underwriters, issuance cost Represents stock issuance cost of exercise of overallotment by underwriters. Issuance of Common Stock upon Private Placement Transaction, Issuance Cost Issuance of common stock upon private placement transaction, issuance cost Represents stock issuance cost of private placement transaction. Convertible Debt Two [Member] A borrowing which can be exchanged for a specified amount of another security, at the option of the issuer or the holder. Convertible promissory notes, Two Mark to Market Adjustment of Warrant Liability Cash Flow Impact This element represents noncash adjustments related to net changes in the market value of warrant liability. Mark-to-market adjustment on warrant liability Increase (Decrease) in Accrued Clinical Expenses The increase (decrease) during the reporting period in the carrying amount of obligations incurred and payable for clinical studies, which covers fees paid to CROs, investigative sites in connection with clinical studies and contract manufacturers in connection with the production of clinical study materials; and fees paid to vendors in connection with the preclinical development activities. Accrued clinical expenses Increase (Decrease) in License Fee Payable Represents increase (decrease) during the reporting period in current portion (due within one year or one business cycle) of license fee payable. License fee payable Withholding Taxes Paid On Share Based Compensensation Withholding taxes paid on vested restricted stock units For net-share settlement of share-based awards when the employers settles employees' income tax withholding obligations, this element represents the value of the number of shares the employee forfeited to the employer pay for such tax obligations which were paid in the period. Unamortized debt discount charged to equity in conjunction with conversion of promissory notes into common stock Unamortized Debt Discount Charged to Equity in Conjunction with Conversion of Promissory Notes in to common stock This element represents Unamortized debt discount charged to equity in conjunction with conversion of promissory notes into common stock. Unamortized debt discount charged to equity in conjunction with conversion of promissory notes into common stock Warrant and Derivative Liabilities Reclassified to Additional Paid in Capital The amount of warrant and derivative liabilities reclassified to additional paid-in capital during the reporting period. Reclassification of warrant and derivative liabilities to additional paid-in capital Reclassification of warrant and derivative liabilities to additional paid-in capital Reclassification of Issuance Costs Charged to Equity Reclassification of issuance costs charged to equity Accrued and Deferred Financing and Debt Issuance Costs This element represents Accrued and deferred financing and debt issuance costs. Accrued and deferred financing and debt issuance costs Repurchase of Common Stock Associated With Restricted Stock Units Witholding taxes on vested restricted stock units For net-share settlement of share-based awards when the employers settles employees' income tax withholding obligations, this element represents the value of the number of shares the employee forfeited to the employer pay for such tax obligations. Accrued financing and issuance costs Accrued Financing and Stock Issuance Costs Incurred During Noncash or Partial Noncash Transaction Represents the amount of accrued financing and stock issuance costs that were incurred during a noncash or partial noncash transaction by the entity during the reporting period. Prepaid Expenses and Other Current Assets Disclosure [Text Block] Represents entire disclosure of prepaid expenses and other current assets. PREPAID EXPENSES AND OTHER CURRENT ASSETS CONVERTIBLE PROMISSORY NOTES AND EQUITY FINANCING Convertible Promissory Notes and Equity Financing Disclosure [Text Block] Represents entire disclosure of convertible promissory notes and equity financing. CONVERTIBLE PROMISSORY NOTES AND EQUITY FINANCING STOCK-BASED COMPENSATION Stock Based Compensation Disclosure [Text Block] The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements. STOCK-BASED COMPENSATION Accumulated comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Additional paid-in capital Additional Paid in Capital, Common Stock Restricted Stock or Unit Expense Gross issuance of RSUs Depreciation Depreciation Issuance of preferred and common stock for license fee, interest and service Issuance of Stock and Warrants for Services or Claims Amortization of debt issuance costs Amortization of Financing Costs CONDENSED BALANCE SHEETS Amortization of discount on convertible notes and notes payable Amortization of Debt Discount (Premium) Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS - Beginning of period CASH AND CASH EQUIVALENTS - End of period Interest paid Interest Paid Increase (Decrease) in Employee Related Liabilities Accrued payroll and related costs Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Common stock, $0.001 par value, 95,000,000 shares authorized; 41,072,592 and 40,933,354 shares issued and outstanding as of March 31, 2012 and December 31, 2011, respectively Common Stock, Value, Issued Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent COMPREHENSIVE LOSS COMPREHENSIVE LOSS Comprehensive Income (Loss) Note [Text Block] Convertible Debt [Member] Convertible promissory notes Convertible Preferred Stock Convertible Preferred Stock [Member] Total current liabilities Liabilities, Current Current liabilities: Liabilities, Current [Abstract] Debt Disclosure [Text Block] NOTES PAYABLE Deficit accumulated during the development stage Development Stage Enterprise, Deficit Accumulated During Development Stage Stock-based compensation expense Share-based Compensation Gain (Loss) on Sale of Property Plant Equipment Realized gain from disposal of property and equipment General and Administrative Expense General and administrative CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS INCOME TAXES Income Tax Disclosure [Text Block] Taxes paid Income Taxes Paid, Net Restricted cash Increase (Decrease) in Restricted Cash Total liabilities Liabilities TOTAL Liabilities and Equity LIABILITIES AND STOCKHOLDERS' (DEFICIT) EQUITY Liabilities and Equity [Abstract] Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations CASH FLOW FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net loss NET LOSS Net Income (Loss) Available to Common Stockholders, Basic RECENT ACCOUNTING PRONOUNCEMENTS Nonoperating Income (Expense) Total other (expense) income OTHER INCOME (EXPENSE): Nonoperating Income (Expense) [Abstract] Notes Payable, Current Short term portion of notes payable, net of discount Notes payable, net of discount Notes Payable, Noncurrent Operating Income (Loss) LOSS FROM OPERATIONS Change in other comprehensive loss-unrealized gain (loss) on investments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other Nonoperating Income (Expense) Other expense and interest income, net EMPLOYEE BENEFIT PLAN Pension and Other Postretirement Benefits Disclosure [Text Block] Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Proceeds from Other Equity Proceeds from issuance of common stock pursuant to exercise of warrant Proceeds from issuance of common stock, net of offering costs Proceeds from Issuance of Common Stock Net proceeds from issuance of preferred stock Proceeds from Issuance of Preferred Stock and Preference Stock Proceeds from Issuance of Warrants Proceeds from issuance of common stock pursuant to exercise of warrant Proceeds from issuance of convertible notes and notes payable, net of issuance costs Proceeds from Issuance of Long-term Debt Proceeds from Sale of Property, Plant, and Equipment Proceeds from disposal of property and equipment Proceeds from Sale of Short-term Investments Proceeds from sale of short-term investments Proceeds from Stock Options Exercised Proceeds from issuance of common stock pursuant to employee stock purchase plan and exercise of stock options, net Property and equipment - net Property, Plant and Equipment, Net PROPERTY AND EQUIPMENT Payments to Acquire Property, Plant, and Equipment Property and equipment purchases Payments to Acquire Short-term Investments Purchase of short-term investments Related Party Transactions Disclosure [Text Block] RELATED PARTY TRANSACTIONS Payments for Repurchase of Common Stock Withholding taxes paid on vested restricted stock units Series B Convertible Preferred Stock Series B Preferred Stock [Member] Series A Convertible Preferred Stock Series A Preferred Stock [Member] Short-term investments Short-term Investments SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] CONDENSED STATEMENTS OF CASH FLOWS STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) AND COMPREHENSIVE LOSS Stockholders' equity Stockholders' Equity Attributable to Parent [Abstract] STOCKHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] STOCKHOLDERS' EQUITY SUPPLEMENTAL CASH DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Total current assets Assets, Current Assets, Current [Abstract] Current assets: Weighted Average Number of Shares Outstanding, Diluted Weighted-average number of shares used in per share calculation-diluted (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted-average number of shares used in per share calculation-basic (in shares) Common Stock Common Stock [Member] PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Research and Development Expense Research and development TOTAL Assets Equity Issuance, Amount Per Share Issuance of stock, per share (in dollars per share) SHARE-BASED COMPENSATION PLANS Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Scenario, Unspecified [Domain] Statement [Table] Statement, Scenario [Axis] ASSETS Assets [Abstract] Statement Statement [Line Items] FAIR VALUE OF INSTRUMENTS Fair Value Disclosures [Text Block] SELECTED QUARTERLY DATA (unaudited) Quarterly Financial Information [Text Block] INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Stockholders' Equity, Period Increase (Decrease) Stockholders' Equity, Period Increase (Decrease) Issuance of warrants in conjunction with debt financing Adjustments to Additional Paid in Capital, Warrant Issued OPERATING EXPENSES: Operating Expenses [Abstract] Operating Expenses Total operating expenses NET LOSS PER SHARE Amortization of premium/(discount) on short-term investments Investment Income, Net, Amortization of Discount and Premium Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Stockholders' Equity Attributable to Parent Total stockholders' (deficit) equity Balance Balance Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares issued and outstanding as of September 30, 2011 and December 31, 2010 Preferred Stock, Value, Issued COMPREHENSIVE LOSS Statement, Equity Components [Axis] Additional Paid-In Capital Additional Paid-in Capital [Member] Deficit Accumulated During Development Stage Retained Earnings [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Member] Equity Component [Domain] Liability accrued for equipment purchases Capital Expenditures Incurred but Not yet Paid Issuance of stock for cash, net of issuance cost Stock Issued During Period, Value, New Issues Issuance of common stock pursuant to employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Issuance of common stock upon release of restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of common stock upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Issuance of stock for cash, net of issuance cost (in shares) Stock Issued During Period, Shares, New Issues Issuance of common stock pursuant to employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock upon release of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of common stock upon exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of stock upon conversion of convertible promissory notes (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Stock Issued During Period, Shares, Period Increase (Decrease) Stock Issued During Period, Shares, Period Increase (Decrease) Debt issuance costs Unamortized Debt Issuance Expense Repurchase of common stock from founder (in shares) Stock Repurchased During Period, Shares Comprehensive Loss Comprehensive Income [Member] Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Issuance of stock, issuance cost Balance (in shares) Balance (in shares) Shares, Issued NET LOSS PER SHARE Earnings Per Share [Text Block] Commitments and Contingencies (Note 5) Commitments and Contingencies. Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Long-term Debt, Type [Axis] Accrued Liabilities [Member] Accrued interest Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Accrued payroll and related costs Employee-related Liabilities, Current Long-term Debt, Type [Domain] Remove Line Stock-based compensation expense related to employee options Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Description of New Accounting Pronouncements Not yet Adopted [Text Block] RECENT ACCOUNTING PRONOUNCEMENTS NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS Net Cash Provided by (Used in) Continuing Operations ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Interest and other income Other (expense) income Interest and Other Income PREPAID EXPENSES AND OTHER CURRENT ASSETS CASH EQUIVALENTS AND INVESTMENTS ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES COMMITMENTS AND CONTINGENCIES Stock Issued During Period, Value, Other Preferred stock issued value Stock Issued During Period, Shares, Other Preferred stock issued (in shares) INCOME TAXES FAIR VALUE OF INSTRUMENTS Subsequent Events [Text Block] SUBSEQUENT EVENTS NOTES PAYABLE EMPLOYEE BENEFIT PLAN SELECTED QUARTERLY DATA (unaudited) SHARE-BASED COMPENSATION PLANS SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES RELATED PARTY TRANSACTIONS SUBSEQUENT EVENTS Conversion of convertible promissory notes and accrued interest into common stock, Series A-2 convertible preferred stock and Series B-2 convertible preferred stock, including unamortized debt discount Debt Conversion, Converted Instrument, Amount Other Significant Noncash Transaction, Value of Consideration Given Beneficial conversion feature Beneficial conversion features Beneficial conversion features Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments Issuance of stock upon conversion of convertible promissory notes Realized (gain)/loss on short-term investments Gain (Loss) on Sale of Investments CASH EQUIVALENTS AND INVESTMENTS Cash, Cash Equivalents, and Short-term Investments [Text Block] Earnings Per Share, Basic and Diluted Net loss per share-basic and diluted (in dollars per share) Noncash Investing and Financing Items [Abstract] NONCASH INVESTING AND FINANCING ACTIVITIES: Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Effect of exchange rates on cash