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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating activities    
Net loss $ (7,814) $ (16,976)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 615 283
Stock-based compensation 2,286 1,554
Changes in revaluation of warrant liability (12,525) 4,387
Deferred income taxes 13 13
Loss on disposal of fixed assets 0 56
Changes in operating assets and liabilities, net of effects of acquired business:    
Accounts receivable 1,647 (1,424)
Inventories (1,411) (1,341)
Other assets (450) 492
Accounts payable (2,625) (2,151)
Accrued liabilities 743 990
Deferred revenue 85 76
Net cash used in operating activities (19,436) (14,041)
Investing activities    
Capital expenditures (1,429) (180)
Purchases of investments and certain other assets (3,492) (13)
Maturities of investments 10,299 0
Net cash provided by (used in) investing activities 5,378 (193)
Financing activities    
Net proceeds from equity incentives and exercise of warrants 2,859 191
Net proceeds from public offering 3,847 51,171
Proceeds from term loan, net of discount and revolving line of credit 9,848 526
Payments on debt, revolving line of credit and landlord provided leasehold incentives (3,419) (6,149)
Net cash provided by financing activities 13,135 45,739
Net (decrease) increase in cash and cash equivalents (923) 31,505
Cash and cash equivalents, beginning of period 29,485 [1] 26,696
Cash and cash equivalents, end of period $ 28,562 $ 58,201
[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.