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Risks and Liquidity (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 26, 2021
Mar. 31, 2021
Dec. 31, 2020
Feb. 20, 2020
Risks and Liquidity [Abstract]        
Accumulated deficit   $ (363,022) $ (322,843)  
Cash, cash equivalents and investments   $ 466,400    
2022 Convertible Notes [Member]        
Shareholders' Equity Disclosure [Abstract]        
Convertible senior notes, interest rate, stated percentage   6.25%   6.25%
Debt instrument maturity date   Aug. 31, 2022    
2022 Convertible Notes [Member] | Subsequent Event [Member]        
Shareholders' Equity Disclosure [Abstract]        
Redemption of principal balance $ 38,400      
Convertible senior notes, interest rate, stated percentage 6.25%      
IPO [Member] | Common Stock [Member]        
Shareholders' Equity Disclosure [Abstract]        
Net proceeds, offering amount     $ 280,800  
Common stock shares issued (in shares)     5,339,286