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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities    
Net loss $ (25,432) $ (7,814)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 835 615
Stock-based compensation 3,179 2,286
Changes in revaluation of warrant liability (3,589) (12,525)
Non-cash interest expense 139  
Deferred income taxes 7 13
Tax benefit from other unrealized gain on available-for-sale securities (2,085)  
Changes in operating assets and liabilities:    
Accounts receivable 69 1,647
Inventories 1,112 (1,411)
Other assets 739 (450)
Accounts payable (4,176) (2,625)
Accrued liabilities (1,538) 743
Deferred revenue 256 85
Net cash used in operating activities (30,484) (19,436)
Investing activities    
Capital expenditures (325) (1,429)
Purchases of investments (69,983) (3,492)
Proceeds from maturities of investments 22,444 10,299
Restricted cash (114)  
Net cash (used in) provided by investing activities (47,978) 5,378
Financing activities    
Net proceeds from equity incentive plans and warrants 5,472 2,859
Net proceeds from public offering 75,324 3,847
Proceeds from loans, net of discount 10,000 9,848
Repayment of debt (56) (3,419)
Net cash provided by financing activities 90,740 13,135
Net increase (decrease) in cash and cash equivalents 12,278 (923)
Cash and cash equivalents, beginning of period 22,781 [1] 29,485
Cash and cash equivalents, end of period $ 35,059 $ 28,562
[1] The financial information in this column was derived from audited consolidated financial statements included in the Company's 2014 Annual Report on Form 10-K.