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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (93,313) $ (36,707)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 125 155
Excess tax provision on (benefit from) stock-based awards 707 (1)
Amortization of debt discount and debt issuance costs 5,654 4,039
Amortization of intangible asset 484 484
Loss (gain) on changes in fair value of derivative liabilities 366 (11,870)
Gain on extinguishment of debt   (38,034)
Deferred income taxes (1,582) 82
Changes in assets and liabilities:    
Restricted cash   400
Accounts receivable (3,397) (3,022)
Inventories (5,971) 14,805
Prepaid and other current assets (2,056) (1,371)
Other non-current assets 529 2,017
Accrued interest payable (1,399) 816
Deferred revenue 14,461 (1,703)
Accounts payable and other current liabilities 14,902 5,456
Other non-current liabilities 222  
Net cash used in operating activities (60,100) (58,685)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (10)  
Net cash used in investing activities (10)  
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of preferred stock, net of transaction costs 57,666  
Proceeds from exercise of stock options, net of transaction costs 31 307
Proceeds from exercise of warrants, net of transaction costs 2,713 1,651
Refund of equity issuance costs   3,191
Debt issuance costs   (2,480)
Excess tax (provision on) benefit from stock-based awards (707) 1
Acquisition of treasury stock (151)  
Payments under capital leases (5) (64)
Net cash provided by financing activities 59,547 2,606
NET DECREASE IN CASH AND CASH EQUIVALENTS (563) (56,079)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 119,539 191,514
CASH AND CASH EQUIVALENTS, END OF PERIOD 118,976 135,435
Cash paid during the year for:    
Interest 10,225 8,622
Income taxes 526 581
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 features 32,987  
Reacquisition of conversion option in convertible notes   10,100
Warrant    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation (9) (503)
Options and Restricted Stock Units    
Adjustments to reconcile loss to net cash used in operating activities:    
Stock-based compensation $ 10,177 $ 6,272