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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (82,776) $ (45,400)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 12 51
Stock-based compensation 14,032 10,471
Amortization of debt discount and debt issuance costs 1,687 1,736
Amortization of intangible asset 484 485
Changes in assets and liabilities:    
Accounts receivable, net (2,330) (14,625)
Other receivables (25,654)  
Inventory, net (13,413) (8,043)
Prepaid and other current assets 520 5,298
Other long-term assets   567
Accrued interest payable (371) (6,959)
Deferred revenue 1,902 1,604
Accounts payable and other current liabilities 36,005 23,670
Other long-term liabilities 7,502 448
Net cash used in operating activities (62,400) (30,697)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (53) (12)
Net cash used in investing activities (53) (12)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of exchangeable debt   30,000
Payment of debt issuance costs   (1,207)
Payment of transaction costs for conversion of preferred stock (39)  
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 16,494 451
Repurchase of exchangeable senior notes   (15,107)
Payment on long-term debt from royalty-bearing instrument (10,539)  
Taxes paid related to stock-based awards (5,638) (2,593)
Net cash provided by financing activities 70,708 11,544
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 8,255 (19,165)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 74,237 98,851
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 82,492 79,686
Cash paid during the year for:    
Interest 16,030 12,536
Income taxes $ 825 $ 1,186