Document And Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Entity Filer Category Current Fiscal Year End Date Entity Common Stock, Shares Outstanding Condensed Consolidated Balance Sheets [Abstract] ASSETS Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Cash and cash equivalents Held-to-maturity Securities, Current Investments Accounts receivable, net Accounts receivable, net Inventory Net Inventories, net Inventory Prepaid Expenses And Other Assets Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current, Total Total current assets Total current assets Long-term investments Long-term investments Equipment, furniture and leasehold improvements, net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Other assets Other Assets, Noncurrent, Total Deferred Tax Assets, Net, Noncurrent Deferred tax asset Deferred Tax Assets, Net, Noncurrent, Total Total assets Total assets LIABILITIES AND SHAREHOLDERS' EQUITY Accounts payable Accounts Payable, Current, Total Accrued Liabilities, Current Accrued expenses Accrued Liabilities, Current, Total Other current liabilities Other current liabilities Other Liabilities, Current, Total Total current liabilities Total current liabilities Commitments and Contingencies 2009 Commitments and contingencies (Note 8) Shareholders' equity: Preferred stock, $.001 par value: authorized 10,000,000 shares: Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred stock, $.001 par value: authorized 10,000,000 shares: Series B Convertible Preferred stock, (liquidation preference of $5,659,000) stated value $1,000 per share, $.001 par value: 10,000 shares designated and 5,659 issued and outstanding as of June 30, 2011 and 5,679 issued and outstanding as of December 31, 2010 Preferred Stock, Value, Issued, Total Preferred stock, $.001 par value: authorized 10,000,000 shares: Series B Convertible Preferred stock, (liquidation preference of $5,659,000) stated value $1,000 per share, $.001 par value: 10,000 shares designated and 5,659 issued and outstanding as of March 31, 2012 and December 31, 2011 Common stock, $.001 par value: authorized 200,000,000 shares, issued and outstanding, 19,938,992 shares as of September 30, 2010 and 16,967,244 as of December 31, 2009 Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock, $.001 par value: authorized 200,000,000 shares, issued and outstanding, 22,128,858 shares as of September 30, 2011 and 21,210,445 as of December 31, 2010 Common Stock, Value, Issued, Total Common stock, $.001 par value: authorized 200,000,000 shares, issued and outstanding, 23,537,978 shares as of March 31, 2012 and 23,513,978 as of December 31, 2011 Additional paid-in capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional paid-in capital Additional paid in capital Accumulated deficit Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Accumulated deficit Treasury Stock, Value Treasury stock, 25,000 shares as of March 31, 2012 and December 31, 2011 Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury stock, 25,000 shares as of December 31, 2011 Total shareholders' equity Balance Balance Total shareholders' equity Total liabilities and shareholders' equity Total liabilities and shareholders' equity Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Convertible Preferred Stock [Member] Series B Convertible Preferred Stock [Member] Preferred stock, par value Preferred stock, par value Preferred stock, shares authorized Preferred stock - Series B, liquidation preference Preferred stock - Series B, stated value Preferred stock, shares issued Preferred Stock, Shares Issued, Total Preferred stock, shares outstanding Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Common stock, par value Common stock, shares authorized Common stock, shares issued Common Stock, Shares, Issued, Total Common stock, shares outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Treasury Stock, Shares Treasury Stock, Shares, Ending Balance Treasury Stock, Shares, Beginning Balance Treasury stock, shares Condensed Consolidated Statements Of Operations [Abstract] Revenue: Product revenue Product Product Contract revenue Contract Revenues Total revenue, net Cost of goods sold: Product revenue cost Product Product revenue Contract Revenue Cost Contract Cost of Revenue Total cost of goods sold Gross Profit Gross profit Operating expenses: Research and development Research and development Selling, general and administrative Selling, general and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Other income (expense): Interest expense, net Interest expense, net Interest expense Other income, net Other income Other income, net Gain (Loss) on Derivative Instruments, Net, Pretax Change in the fair value of warrant liability Gain (Loss) on Derivative Instruments, Net, Pretax, Total Nonoperating Income (Expense) Total other income (expense), net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Loss before benefit from income taxes Provision for income taxes Provision for income taxes Benefit from income taxes Net income Net loss Net loss Net income (loss) Income (loss) per share, basic Income per share, basic Loss per common share, basic Income (loss) per share, diluted Income per share, diluted Loss per common share, diluted Weighted average number of shares outstanding: Basic Weighted Average Number of Shares Outstanding, Basic, Total Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Condensed Consolidated Statements Of Cash Flows [Abstract] Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Cash flows from operating activities: Adjustments to reconcile net (loss) income to net cash provided by operating activities: Adjustments to reconcile net loss to net cash provided by operating activities: Depreciation and amortization Depreciation, Depletion and Amortization, Total (Reduction of) provision for sales returns and doubtful accounts (Reduction of) provision for sales returns and doubtful accounts Reduction of provision for doubtful accounts Deferred Income Tax Expense (Benefit) Deferred tax benefit Deferred Income Tax Expense (Benefit), Total Share-based Compensation Stock-based compensation Share-based Compensation, Total Increase decrease in warrant liabilities Increase Decrease in Warrant Liabilities Change in the fair value of warrant liability Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Accounts receivable Accounts receivable Increase (Decrease) in Inventories Inventories, net Inventory Increase (Decrease) in Inventories, Total Increase (Decrease) in Prepaid, Deferred Expense and Other Assets Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) in Prepaid, Deferred Expense and Other Assets, Total Accounts payable, accrued compensation and other accrued expenses Accounts payable, accrued expenses and other current liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Net cash provided by operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities Cash flows from investing activities: Purchase of equipment Purchase of equipment Purchase of investments - held to maturity Purchase of investments Net Cash Provided By Used In Investing Activities Net cash used in investing activities Net cash used in investing activities Net Cash Provided By Used In Financing Activities Abstract Cash flows from financing activities: Cash flows from financing activities: Proceeds from Exercise of Stock Options and Warrants Proceeds from Exercise of Stock Options and Warrants Proceeds from exercise of stock options and warrants Net cash provided by (used in) financing activities Net cash provided by financing activities Net increase in cash and cash equivalents Net decrease in cash and cash equivalents Cash paid for interest, net of amount capitalized of $4 thousand in 2012 Interest Paid, Total Cash paid for taxes Non-cash financing transactions: Issuance of stock as result of cashless exercise of warrants Issuance of Stock as Result of Cashless Exercise of Warrants Issuance of 310,897 shares of common stock for cashless exercise of 380,511 warrants in 2011 Stock Issued During Period, Shares, Cashless Stock Warrants Exercised Stock Issued During Period Shares Cashless Stock Warrants Exercised Cashless exercise of common stock warrants, shares Issuance of shares, common stock, warrants Cashless Exercise Of Warrants Cashless Exercise Of Warrants Cashless exercise of warrants Interest Paid, Capitalized Interest capitalized Summary Of Significant Accounting Policies [Abstract] Description of the Business and Summary of Significant Account Policies Description Of The Business And Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies Accounts Receivable [Abstract] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Accounts Receivable Inventories, Net [Abstract] Inventory Disclosure [Text Block] Inventories, Net Line Of Credit [Abstract] Debt Disclosure [Text Block] Line Of Credit Stock-Based Compensation [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Shareholders' Equity [Abstract] Stockholders' Equity Note Disclosure [Text Block] Shareholders' Equity Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Commitments And Contingencies [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments And Contingencies Concentrations [Abstract] Concentration Risk Disclosure [Text Block] Concentrations Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events