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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (22,926) $ (29,713)
Adjustments to reconcile loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 446 53
Amortization of investments 771  
Stock-based compensation 34,305 22,729
Amortization of debt discount and debt issuance costs 601 1,282
Amortization of intangible asset 1,081 484
Changes in assets and liabilities:    
Accounts receivable, net (30,862) (37,060)
Inventory (71,762) 3,245
Prepaid and other current assets (13,023) (9,914)
Other long-term assets   (900)
Interest receivable (1,732)  
Accrued interest payable (348) (145)
Deferred revenue (1,941) (1,131)
Accounts payable and other current liabilities 121,240 54,962
Other long-term liabilities 727 (4,322)
Net cash provided by (used in) operating activities 16,577 (430)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Sale and maturities of securities 186,714  
Purchases of securities (587,111)  
Purchases of furniture, fixtures and equipment (252) (2,114)
Net cash used in investing activities (400,649) (2,114)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock, net of transaction costs 848 440,945
Proceeds from exercise of stock options, net of transaction costs 1,861 19,544
Payment of transaction costs for conversion of preferred stock (266)  
Payment on debt from royalty-bearing instrument (40,916) (21,441)
Taxes paid related to stock-based awards (14,828) (10,120)
Net cash (used in) provided by financing activities (53,301) 428,928
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (437,373) 426,384
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 648,495 250,727
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 211,122 677,111
Cash paid during the year for:    
Interest 1,882 3,577
Income taxes $ 197 87
Supplemental disclosure of non-cash transactions:    
Initial recognition of operating lease right-of-use asset   $ 8,995