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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities    
Net income (loss) $ (14,201) $ (9,247)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 582 697
Stock-based compensation 1,911 1,386
Changes in revaluation of warrant liability (86) (3,822)
Gain on sale of fixed assets (9) (20)
Non-cash interest expense 15 0
Changes in operating assets and liabilities:    
Accounts receivable 2,146 9
Inventories (3,238) (3,372)
Other assets (2,006) (85)
Accounts payable 1,020 550
Accrued liabilities 2,219 (472)
Deferred revenue 605 (174)
Net cash used in operating activities (11,042) (14,550)
Investing activities    
Purchases of furniture, equipment and leasehold improvements (97) (117)
Purchases (sales) of certain other assets 1 (90)
Maturities of investments 287 497
Net cash provided by investing activities 191 290
Financing activities    
Net proceeds from equity incentives and the exercise of warrants 298 142
Net proceeds from public offering 10,823 0
Proceeds from revolving line of credit 1,219 0
Proceeds from debt, net of discount 0 4,910
Payments on revolving line of credit (236) 0
Payments on debt and landlord provided leasehold incentives (89) (4,979)
Net cash provided by financing activities 12,015 73
Net increase (decrease) in cash and cash equivalents 1,164 (14,187)
Cash and cash equivalents, beginning of period 25,497 28,948
Cash and cash equivalents, end of period 26,661 14,761
Supplemental disclosures:    
Cash paid for interest 330 955
Non-cash conversion of preferred stock to common stock $ 9,496 $ 0