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Common Stock and Stockholders' Equity - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other disclosures    
Stock-based compensation $ 18,315 $ 13,523
RSUs    
Shares    
Outstanding at beginning of period (in shares) 1,483,558  
Granted (in shares) 321,311  
Vested and issued (in shares) (455,956)  
Forfeited (in shares) (54,476)  
Outstanding at end of period (in shares) 1,294,437  
Vested and unissued (in shares) 13,755  
Nonvested (in shares) 1,280,682  
Weighted-Average Grant Date Fair Value Per Share    
Outstanding at beginning of period (in dollars per share) $ 54.13  
Granted (in dollars per share) 122.96  
Vested and issued (in dollars per share) 51.79  
Forfeited (in dollars per share) 48.78  
Outstanding at end of period (in dollars per share) 58.82  
Vested and unissued (in dollars per share) 50.90  
Non-vested (in dollars per share) $ 58.91  
Other disclosures    
Grant date fair value of RSUs granted $ 39,500 48,000
Stock-based compensation 9,400 $ 5,000
Unrecognized compensation cost related to non vested $ 82,800  
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  
Employee | RSUs    
Common Stock and Stockholders' Equity    
Vesting period 3 years