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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (43,125) $ (62,638)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 79 85
Loss on sale of fixed assets 48  
Stock-based compensation 6,962 6,258
Amortization of debt discount and debt issuance costs 5,038 3,688
Amortization of intangible asset 322 323
(Gain) loss on change in fair value of derivative liabilities (4,560) 136
Deferred income taxes (1,846) (731)
Changes in assets and liabilities:    
Accounts receivable (3,813) (2,101)
Inventories (1,321) (6,766)
Prepaid and other current assets (2,324) 1,325
Other non-current assets   318
Accrued interest payable (1,416) 11
Deferred revenue 1,470 14,625
Accounts payable and other current liabilities 10,773 6,976
Other non-current liabilities (67) 240
Net cash used in operating activities (33,780) (38,260)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of equipment (21)  
Net cash used in investing activities (21)  
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of preferred stock, net of transaction costs   52,149
Proceeds from exercise of stock options, net of transaction costs 124 31
Proceeds from exercise of warrants, net of transaction costs   2,713
Taxes paid related to stock-based awards (793) (117)
Payments under capital leases   (5)
Net cash (used in) provided by financing activities (669) 54,771
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (34,470) 16,511
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 106,961 119,539
CASH AND CASH EQUIVALENTS, END OF PERIOD 72,491 136,050
Cash paid during the year for:    
Interest 7,668 5,829
Income taxes $ 767 171
Non-cash transactions:    
Transfer of preferred stock purchase option derivative liability to equity   868
Conversion of Series A Convertible Preferred Stock into common stock   4,804
Accretion of preferred stock beneficial conversion feature   31,341
Warrant    
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation   $ (9)