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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Operating activities    
Net loss $ (8,834) $ (5,098)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 208 269
Stock-based compensation 542 472
Loss from revaluation of warrant liability 4,461 1,278
Gain on sale of fixed assets (8) (9)
Non-cash interest expense 6 49
Changes in operating assets and liabilities:    
Accounts receivable 1,074 (8)
Inventories (2,459) (3,081)
Other assets (124) (193)
Accounts payable (530) 2,001
Accrued liabilities 1,674 (651)
Deferred revenue 86 (87)
Net cash used in operating activities (3,904) (5,058)
Investing activities    
Purchases of furniture, equipment and leasehold improvements (2) (51)
Purchases of certain other assets (2) (4)
Maturities of investments 200 218
Net cash provided by investing activities 196 163
Financing activities    
Net proceeds from equity incentive plans 77 10
Net proceeds from public offering 9,612 0
Payments on debt and landlord provided leasehold incentives (29) (464)
Net cash provided by (used in) financing activities 9,660 (454)
Net increase (decrease) in cash and cash equivalents 5,952 (5,349)
Cash and cash equivalents, beginning of period 25,497 28,948
Cash and cash equivalents, end of period 31,449 23,599
Supplemental disclosures:    
Cash paid for interest $ 83 $ 114