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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (58,897) $ (93,313)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 114 125
Loss on sale of fixed assets 48  
Stock-based compensation 10,376 10,177
Amortization of debt discount and debt issuance costs 7,246 5,654
Amortization of intangible asset 484 484
(Gain) loss on change in fair value of derivative liabilities (8,170) 366
Deferred income taxes (3,134) (1,582)
Changes in assets and liabilities:    
Accounts receivable (3,678) (3,397)
Inventories (788) (5,971)
Prepaid and other current assets (2,589) (2,056)
Other non-current assets (508) 529
Accrued interest payable (4,730) (1,399)
Deferred revenue 1,177 14,461
Accounts payable and other current liabilities 10,149 14,902
Other non-current liabilities 396 222
Net cash used in operating activities (52,504) (60,807)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of equipment (21) (10)
Net cash used in investing activities (21) (10)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of preferred stock, net of transaction costs   57,666
Proceeds from issuance of common stock, net of transaction costs 64,614  
Proceeds from exercise of stock options, net of transaction costs 136 31
Proceeds from exercise of warrants, net of transaction costs   2,713
Transaction costs related to exchange of exchangeable senior notes (678)  
Taxes paid related to stock-based awards (946) (151)
Payments under capital leases   (5)
Net cash provided by financing activities 63,126 60,254
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 10,601 (563)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 106,961 119,539
CASH AND CASH EQUIVALENTS, END OF PERIOD 117,562 118,976
Cash paid during the year for:    
Interest 13,839 10,225
Income taxes 1,093 526
Non-cash transactions:    
Exchange of exchangeable senior notes into common stock $ 128,115  
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 features   32,987
Warrant    
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation   $ (9)