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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (26,251) $ (58,305)
Adjustments to reconcile loss to net cash used in operating activities:    
Depreciation and amortization 6 11
Stock-based compensation 14,766 7,381
Amortization of debt discount and debt issuance costs 878 1,140
Amortization of intangible asset 323 323
Changes in assets and liabilities:    
Accounts receivable, net (28,875) (4,991)
Inventory 11,534 (9,833)
Prepaid and other current assets (4,158) 577
Other long-term assets (928)  
Accrued interest payable (81) (58)
Deferred revenue (973) (248)
Accounts payable and other current liabilities 14,765 24,146
Other long-term liabilities (3,186) 5,614
Net cash used in operating activities (22,180) (34,243)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (801)  
Net cash used in investing activities (801)  
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of transaction costs 837 70,430
Proceeds from exercise of stock options, net of transaction costs 17,344 1,826
Payment on long-term debt from royalty-bearing instrument (12,533) (6,713)
Taxes paid related to stock-based awards (10,120) (2,680)
Net cash (used in) provided by financing activities (4,472) 62,863
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (27,453) 28,620
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 250,727 74,237
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 223,274 102,857
Cash paid during the year for:    
Interest 14,982 10,251
Income taxes 71 $ 805
Supplemental disclosure of non-cash transactions:    
Initial recognition of operating lease right-of-use asset $ 8,995