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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Operating activities    
Net loss $ (11,323) $ (10,832)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 520 369
Stock-based compensation 923 798
Loss from revaluation of warrant liability 1,617 1,615
Gain (loss) on sale of fixed assets (16) 39
Non-cash interest expense 93 51
Other-than-temporary loss on marketable securities 0 35
Changes in operating assets and liabilities, net of effects of acquired business:    
Accounts receivable 372 158
Inventories (4,011) 1,440
Other assets 133 (208)
Accounts payable 1,452 (910)
Accrued restructuring 0 (113)
Accrued liabilities (672) (579)
Deferred revenue (125) (133)
Net cash used in operating activities (11,037) (8,270)
Investing activities    
Purchase of furniture, equipment and leasehold improvements (70) (797)
Purchase of certain other assets (90) (44)
Maturities of investments 341 970
Net cash provided by investing activities 181 129
Financing activities    
Net proceeds from issuance of common stock due to exercise of stock options and purchase from ESPP 20 196
Proceeds from note payable, net of discount 0 4,852
Payments on capital lease obligations and notes (945) (55)
Net cash provided by (used in) financing activities (925) 4,993
Net decrease in cash and cash equivalents (11,781) (3,148)
Cash and cash equivalents, beginning of period 28,948 17,287
Cash and cash equivalents, end of period 17,167 14,139
Supplemental disclosures:    
Cash paid for interest $ 401 $ 154