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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (16,138) $ (26,251)
Adjustments to reconcile loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 296 6
Amortization of investments 33  
Stock-based compensation 22,722 14,766
Amortization of debt discount and debt issuance costs 490 878
Amortization of intangible asset 720 323
Changes in assets and liabilities:    
Accounts receivable, net (8,555) (28,875)
Inventory (48,075) 11,534
Prepaid and other current assets (10,273) (4,158)
Other long-term assets   (928)
Interest receivable (1,312)  
Accrued interest payable (240) (81)
Deferred revenue (633) (973)
Accounts payable and other current liabilities 65,530 14,765
Other long-term liabilities 1,159 (3,186)
Net cash provided by (used in) operating activities 5,724 (22,180)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Sale and maturities of securities 131,440  
Purchases of securities (527,479)  
Purchases of furniture, fixtures and equipment (251) (801)
Net cash used in investing activities (396,290) (801)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of transaction costs 848 837
Proceeds from exercise of stock options, net of transaction costs 1,658 17,344
Payment of transaction costs for conversion of preferred stock (238)  
Payment on debt from royalty-bearing instrument (27,925) (12,533)
Taxes paid related to stock-based awards (14,352) (10,120)
Net cash used in financing activities (40,009) (4,472)
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (430,575) (27,453)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 648,495 250,727
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 217,920 223,274
Cash paid during the year for:    
Interest 1,193 14,982
Income taxes $ 20 71
Supplemental disclosure of non-cash transactions:    
Initial recognition of operating lease right-of-use asset   $ 8,995