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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 6,182 $ (16,138)
Adjustments to reconcile income (loss) to net cash (used in) provided by operating activities:    
Depreciation and amortization 299 296
Amortization of investments 1,126 33
Stock-based compensation 16,404 22,722
Amortization of debt discount and debt issuance costs   490
Amortization of intangible asset 997 720
Changes in assets and liabilities:    
Accounts receivable, net (27,685) (8,555)
Inventory (83,591) (48,075)
Prepaid and other current assets 2,521 (10,273)
Other long-term assets (24)  
Interest receivable 672 (1,312)
Accrued interest payable   (240)
Deferred revenue (1,164) (633)
Accounts payable and other current liabilities 51,279 65,530
Other long-term liabilities (773) 1,159
Net cash (used in) provided by operating activities (33,757) 5,724
CASH FLOWS FROM INVESTING ACTIVITIES:    
Sale and maturities of securities 253,084 131,440
Purchases of securities (74,510) (527,479)
Disposal (purchase) of furniture, fixtures and equipment 4 (251)
Net cash provided by (used in) investing activities 178,578 (396,290)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of transaction costs 1,028 848
Proceeds from exercise of stock options, net of transaction costs 2,134 1,658
Payment of transaction costs for conversion of preferred stock   (238)
Payment on debt from royalty-bearing instrument   (27,925)
Taxes paid related to stock-based awards (7,929) (14,352)
Net cash used in financing activities (4,767) (40,009)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 140,054 (430,575)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 190,879 648,495
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 330,933 217,920
Cash Received Paid During Period For [Abstract]    
Interest   (1,193)
Income taxes 3,711 $ (20)
Supplemental disclosure of non-cash transactions:    
Laxdale Milestone $ 12,000