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Introduction (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 05, 2019
May 06, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]          
Payments of deferred offering costs     $ 0 $ 0 $ 2,415
U.S. net revenues | Long-lived assets | Geographic Concentration Risk          
Subsidiary, Sale of Stock [Line Items]          
Concentration risk     90.00%    
Common Stock          
Subsidiary, Sale of Stock [Line Items]          
Number of common stock shares converted (in shares)       41,562,111  
IPO          
Subsidiary, Sale of Stock [Line Items]          
Sale of stock, number of shares issued in transaction   11,068,750      
Sale of stock, price per share (in dollars per share)   $ 25.00      
Proceeds from IPO, net   $ 252,400      
Underwriting discounts and commissions   19,400      
Sale of stock, issuance costs   $ 4,900      
Number of common stock shares converted (in shares)   41,562,111      
Number of shares issued for each share of convertible preferred stock converted (in shares)   1      
Payments of deferred offering costs       $ 2,500 2,400
Deferred offering costs       $ 4,900 $ 4,900
IPO | Common Stock          
Subsidiary, Sale of Stock [Line Items]          
Number of common stock shares converted (in shares)       11,068,750  
Number of shares able to purchase (in shares)   160,767      
Secondary Offering          
Subsidiary, Sale of Stock [Line Items]          
Sale of stock, price per share (in dollars per share) $ 160.00        
Proceeds from IPO, net $ 37,400        
Underwriting discounts and commissions 1,500        
Sale of stock, issuance costs $ 1,100        
Number of shares issued 3,487,500        
Payments of deferred offering costs       $ 2,200  
Deferred offering costs       $ 1,100  
Secondary Offering | Common Stock          
Subsidiary, Sale of Stock [Line Items]          
Number of common stock shares converted (in shares)       250,000  
Over-allotment option          
Subsidiary, Sale of Stock [Line Items]          
Number of shares issued 250,000