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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (58,305) $ (34,575)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 11 38
Stock-based compensation 7,381 6,976
Amortization of debt discount and debt issuance costs 1,140 1,147
Amortization of intangible asset 323 323
Changes in assets and liabilities:    
Accounts receivable, net (4,991) (17,490)
Inventory, net (9,833) (4,307)
Prepaid and other current assets 577 4,907
Other long-term assets   568
Accrued interest payable (58) (3,828)
Deferred revenue (248) (336)
Accounts payable and other current liabilities 24,146 21,709
Other long-term liabilities 5,614 448
Net cash used in operating activities (34,243) (24,420)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment   (12)
Net cash used in investing activities   (12)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of exchangeable debt   30,000
Payment of debt issuance costs   (1,207)
Proceeds from issuance of common stock, net of transaction costs 70,007  
Proceeds from issuance of common stock under employee stock purchase plan 423  
Proceeds from exercise of stock options, net of transaction costs 1,826 396
Repurchase of exchangeable senior notes   (15,107)
Payment on long-term debt from royalty-bearing instrument (6,713)  
Taxes paid related to stock-based awards (2,680) (2,437)
Net cash provided by financing activities 62,863 11,645
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 28,620 (12,787)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 74,237 98,851
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 102,857 86,064
Cash paid during the year for:    
Interest 10,251 7,546
Income taxes $ 805 $ 778