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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2019
Cash flows from operating activities            
Net loss $ (41,001) $ (23,086)   $ (128,436) $ (21,824)  
Adjustments to reconcile net loss to net cash provided by (used in) operating activities            
Loss (gain) from Continuation Advances     $ (34,000) 52,000 (34,000) $ (18,000)
Depreciation       3,198 3,246  
Amortization of operating lease right-of-use assets       1,591 1,392  
Amortization of debt discount and financing costs       226 129  
Stock-based compensation       25,970 7,266  
Amortization (accretion) from investment premium (discount)       1,782 (177)  
Changes in assets and liabilities            
Accounts receivable       (3,099) 3,888  
Inventory       (5,030) (3,822)  
Prepaid expenses and other assets       (307) 524  
Accounts payable       1,403 (1,039)  
Accrued expenses       5,560 (1,039)  
Deferred revenue       9,402 (1,098)  
Operating lease liabilities       (2,144) (1,835)  
Other liabilities       (932) 1,963  
Deferred gain from Reverse Termination fee         98,000  
Net cash provided by (used in) operating activities       (38,816) 51,574  
Cash flows from investing activities            
Purchase of property and equipment       (1,970) (436)  
Purchase of investments       (635,400) (119,200)  
Sales of investments       34,557    
Maturities of investments       150,175 62,450  
Net cash used in investing activities       (452,638) (57,186)  
Cash flows from financing activities            
Continuation Advances       (52,000) 34,000  
Notes payable principal payoff         (16,000)  
Proceeds from issuance of Convertible Senior Notes, net of issuance costs       895,536    
Issuance costs paid for underwritten public equity offering       (246)    
Proceeds from issuance of common stock from equity plans       25,311 827  
Net cash provided by financing activities       868,601 18,827  
Net increase in cash and cash equivalents and restricted cash       377,147 13,215  
Cash and cash equivalents and restricted cash at beginning of period     $ 33,627 85,947 33,627  
Cash and cash equivalents and restricted cash at end of period 463,094 46,842   463,094 46,842 $ 33,627
Cash and cash equivalents at end of period 459,794 43,342   459,794 43,342  
Restricted cash at end of period $ 3,300 $ 3,500   $ 3,300 $ 3,500