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Common Stock and Stockholders' Equity - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other disclosures        
Stock-based compensation $ 21,928 $ 17,368 $ 40,243 $ 30,891
RSUs        
Shares        
Outstanding at beginning of period (in shares)     1,483,558  
Granted (in shares)     342,383  
Vested and issued (in shares)     (565,724)  
Forfeited (in shares)     (73,072)  
Outstanding at end of period (in shares) 1,187,145   1,187,145  
Vested and unissued (in shares) 13,755   13,755  
Nonvested (in shares) 1,173,390   1,173,390  
Weighted-Average Grant Date Fair Value Per Share        
Outstanding at beginning of period (in dollars per share)     $ 54.13  
Granted (in dollars per share)     125.69  
Vested and issued (in dollars per share)     52.11  
Forfeited (in dollars per share)     52.17  
Outstanding at end of period (in dollars per share) $ 58.82   58.82  
Vested and unissued (in dollars per share) 50.90   50.90  
Non-vested (in dollars per share) $ 58.91   $ 58.91  
Other disclosures        
Grant date fair value of RSUs granted $ 3,500 6,800 $ 43,000 56,500
Stock-based compensation 11,300 $ 7,800 20,700 $ 12,800
Unrecognized compensation cost related to non vested $ 74,800   $ 74,800  
Period over which unrecognized compensation cost is expected to be recognized     1 year 9 months 18 days  
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