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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2015
Mar. 31, 2022
Mar. 31, 2021
Stock-Based Compensation      
Unrecognized compensation expense   $ 239.0  
Unrecognized compensation expense, recognition period   1 year  
Aggregate intrinsic value, stock options and vesting RSA's   $ 5.6 $ 81.5
Aggregate intrinsic value, outstanding   $ 154.0  
Remaining term, outstanding (in years)   7 years 8 months 12 days  
Aggregate intrinsic value, exercisable   $ 47.0  
Remaining term, exercisable (in years)   6 years 7 months 6 days  
ESPP      
Stock-Based Compensation      
Authorized (in shares)   600,000  
Subscription rate cap   15.00%  
Maximum discount rate   85.00%  
Shares available for grant (in shares)   137,139  
2015 Plan      
Stock-Based Compensation      
Authorized (in shares)   12,400,000  
Term (in years) 10 years    
Minimum grant price, percent of common stock fair value 100.00%    
Shares available for grant (in shares)   2,666,535  
2015 Plan | Minimum      
Stock-Based Compensation      
Vesting period 1 year    
2015 Plan | Maximum      
Stock-Based Compensation      
Vesting period 4 years