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Common Stock and Stockholders' Equity - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other disclosures      
Stock-based compensation $ 475,531 $ 66,702 $ 43,769
RSUs      
Common Stock and Stockholders' Equity      
Vesting period 3 years    
Shares      
Outstanding at beginning of period (in shares) 1,483,558    
Granted including replacement awards for merger (in shares) 4,205,573    
Vested and issued (in shares) (1,819,566)    
Forfeited (in shares) (318,970)    
Outstanding at end of period (in shares) 3,550,595 1,483,558  
Vested and unissued (in shares) 13,755    
Nonvested (in shares) 3,536,840    
Weighted-Average Grant Date Fair Value Per Share      
Outstanding at beginning of period (in dollars per share) $ 54.13    
Granted including replacement awards for merger (in dollars per share) 190.46    
Vested and issued (in dollars per share) 142.84    
Forfeited (in dollars per share) 148.43    
Outstanding at end of period (in dollars per share) 161.68 $ 54.13  
Vested and unissued (in dollars per share) 50.90    
Non-vested (in dollars per share) $ 162.11    
Other disclosures      
Grant date fair value of RSUs granted $ 801,000 $ 56,700 49,300
Stock-based compensation 314,100 $ 30,500 $ 16,700
Unrecognized compensation cost related to non vested awards $ 460,900    
Period over which unrecognized compensation cost is expected to be recognized 2 years    
Minimum | RSUs      
Common Stock and Stockholders' Equity      
Vesting period 1 year    
Maximum | RSUs      
Common Stock and Stockholders' Equity      
Vesting period 4 years    
Assumed Plan | RSUs      
Other disclosures      
Grant date fair value of RSUs granted $ 712,400    
Accelerated cost $ 240,400