Document and Entity Information [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Short-term Investments Accounts receivable, net Accounts Receivable, Net, Current Inventory Inventory, Net Prepaid expenses and other assets Prepaid Expense and Other Assets Total current assets Assets, Current, Total Total current assets Property and equipment, net Property, Plant and Equipment, Net Total assets Assets, Total Total assets Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Total current liabilities Liabilities, Current, Total Total current liabilities Noncurrent liabilities Liabilities, Noncurrent Commitments and contingencies (Note 5) Commitments and Contingencies Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.0001 par value; 5,000,000 shares authorized, none issued and outstanding at December 31, 2011 and 2010. Preferred Stock, Value, Issued Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, $0.0001 par value; 75,000,000 shares authorized, 27,244,059 and 20,877,171 shares issued and outstanding at December 31, 2011 and 2010, respectively Common Stock, Value, Issued Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common Stock, Shares, Outstanding Ending balance, shares Beginning balance, shares Common stock, shares outstanding Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Stockholders' Equity Attributable to Parent, Total Ending balance Beginning balance Total stockholders' equity Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity, Total Total liabilities and stockholders' equity Revenue Revenue, Net Cost of revenue Cost of Revenue Gross profit Gross Profit Gross profit Operating expenses: Operating Expenses [Abstract] Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Total operating expenses Operating Expenses, Total Total operating expenses Operating loss Operating Income (Loss) Operating loss Other income, net Other Nonoperating Income (Expense) Net loss Net Income (Loss) Attributable to Parent Net loss Net loss per common share - basic and diluted Earnings Per Share, Basic and Diluted Weighted Average Common Shares Outstanding Basic and Diluted Weighted average common shares outstanding - basic and diluted Weighted average common shares outstanding -- basic and diluted Statement [Table] Statement [Line Items] Common Stock Additional Paid-In Capital Accumulated Other Comprehensive Income (Loss) Accumulated Deficit Issuance of common stock from exercised options, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of common stock from exercised options Stock Issued During Period, Value, Stock Options Exercised Stock based compensation Stock Issued During Period, Value, Share-based Compensation, Gross Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Issuance of common stock from equity financing, shares Stock Issued During Period, Shares, New Issues Issuance of common stock from equity financing Stock Issued During Period, Value, New Issues Issuance of common stock from employee stock purchase plan, shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock from employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Stock-based compensation Share-based Compensation Allowance for Excess and Obsolete Inventory Allowance for excess and obsolete inventory Allowance for excess and obsolete inventory Provision for bad debts Provision for Doubtful Accounts Loss on sale of fixed assets Gain (Loss) on Disposition of Assets Loss on sale of fixed assets Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Decrease in accounts receivable Increase (Decrease) in Accounts Receivable Decrease in accounts receivable (Increase) decrease in inventory Increase (Decrease) in Inventories (Increase) decrease in inventory (Increase) decrease in prepaid expenses Increase (Decrease) in Prepaid Expense (Increase) decrease in prepaid expenses Increase (decrease) in accounts payable Increase (Decrease) in Accounts Payable Increase (decrease) in accrued expenses Increase (Decrease) in Accrued Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Purchases of investments Payments to Acquire Investments Purchases of investments Sales and maturities of investments Proceeds from Sale, Maturity and Collection of Investments Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Net cash provided by investing activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Proceeds from exercise of stock options Proceeds from Stock Options Exercised Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization [Abstract] Organization [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Property and Equipment [Abstract] Property and Equipment [Abstract] Accrued Expenses [Text Block] Accrued Expenses Accrued Expenses Accrued Expenses [Abstract] Accrued Expenses [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies [Abstract] Commitments and Contingencies [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity and Comprehensive Loss [Abstract] Stockholders' Equity and Comprehensive Loss [Abstract] Stock Incentive Plans and Stock-Based Compensation Compensation and Employee Benefit Plans [Text Block] Stock Incentive Plans and Stock-Based Compensation [Abstract] Stock Incentive Plans and Stock-Based Compensation [Abstract] Income Taxes Income Tax Disclosure [Text Block] Income Taxes [Abstract] Income Taxes [Abstract] Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Quarterly Data (Unaudited) Quarterly Financial Information [Text Block] Quarterly Data (Unaudited) [Abstract] Quarterly Data (Unaudited) [Abstract] VALUATION AND QUALIFYING ACCOUNTS Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts [Abstract] Amendment Flag Current Fiscal Year End Date Document Period End Date Document Type Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Public Float Document Fiscal Period Focus Document Fiscal Year Focus Consolidated Balance Sheets [Abstract] Consolidated Statements of Operations [Abstract] Consolidated Statements of Stockholders' Equity [Abstract] Consolidated Statements of Cash Flows [Abstract]