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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (20,941) $ (29,771)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 21 44
Loss on sale of fixed assets   48
Stock-based compensation 3,351 3,597
Amortization of debt discount and debt issuance costs 563 2,473
Amortization of intangible asset 162 161
Loss on change in fair value of derivative liabilities   1,250
Deferred income taxes   (446)
Changes in assets and liabilities:    
Accounts receivable, net (9,465) (1,193)
Inventory (3,372) (2,359)
Prepaid and other current assets 2,198 (2,953)
Other long-term assets 89  
Accrued interest payable (2,267) (2,015)
Deferred revenue (293) 1,763
Accounts payable and other current liabilities 15,580 4,531
Other long-term liabilities 457 (35)
Net cash used in operating activities (13,917) (24,905)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (12) (21)
Net cash used in investing activities (12) (21)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of convertible debt 30,000  
Payment of debt issuance costs (1,207)  
Proceeds from exercise of stock options, net of transaction costs 296 22
Repurchase of exchangeable senior notes (15,107)  
Taxes paid related to stock-based awards (2,228) (694)
Net cash provided by (used in) financing activities 11,754 (672)
NET DECREASE IN CASH AND CASH EQUIVALENTS (2,175) (25,598)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 98,251 106,961
CASH AND CASH EQUIVALENTS, END OF PERIOD 96,076 81,363
Cash paid during the year for:    
Interest 4,111 5,138
Income taxes $ 64 $ 267