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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Operating activities    
Net loss $ (10,741) $ (11,507)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 402 520
Stock-based compensation 1,216 923
Changes in revaluation of warrant liability 787 1,617
Gain on sale of fixed assets (8) (16)
Non-cash interest expense 10 93
Changes in operating assets and liabilities:    
Accounts receivable 2,371 372
Inventories (2,929) (3,827)
Other assets (14) 133
Accounts payable (1,172) 1,452
Accrued liabilities 763 (672)
Deferred revenue 25 (125)
Net cash used in operating activities (9,290) (11,037)
Investing activities    
Purchases of furniture, equipment and leasehold improvements (63) (70)
Purchases (sales) of certain other assets 2 (90)
Maturities of investments 287 341
Net cash provided by investing activities 226 181
Financing activities    
Net proceeds from equity incentives 226 20
Net proceeds from public offering 9,876 0
Proceeds from warrants exercise 17 0
Proceeds from revolving line of credit 175 0
Payments on debt and landlord provided leasehold incentives (60) (945)
Net cash provided by (used in) financing activities 10,234 (925)
Net increase (decrease) in cash and cash equivalents 1,170 (11,781)
Cash and cash equivalents, beginning of period 25,497 28,948
Cash and cash equivalents, end of period 26,667 17,167
Supplemental disclosures:    
Cash paid for interest 204 266
Non-cash conversion of preferred stock to common stock $ 9,496 $ 0