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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities    
Net loss $ (225) $ (10,252)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 325 167
Stock-based compensation 946 713
Changes in revaluation of warrant liability (9,034) 5,073
Non-cash interest expense 0 4
Deferred income taxes 6 7
Loss on disposal of fixed assets 0 56
Changes in operating assets and liabilities, net of effects of acquired business:    
Accounts receivable 1,182 (289)
Inventories 1,117 (1,624)
Other assets (764) 910
Accounts payable (2,181) (3,299)
Accrued liabilities (1,295) 85
Deferred revenue 98 97
Net cash used in operating activities (9,825) (8,352)
Investing activities    
Capital expenditures (839) (26)
Purchases of investments and certain other assets (460) 0
Maturities of investments 4,300 0
Net cash provided by (used in) investing activities 3,001 (26)
Financing activities    
Net proceeds from equity incentive plans 1,425 152
Net proceeds from public offering 31 51,502
Proceeds from revolving line of credit 0 526
Payments on debt, revolving line of credit and landlord provided leasehold incentives (125) (1,335)
Net cash provided by financing activities 1,331 50,845
Net increase in cash and cash equivalents (5,493) 42,467
Cash and cash equivalents, beginning of period 29,485 [1] 26,696
Cash and cash equivalents, end of period $ 23,992 $ 69,163
[1] The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.