v3.19.3.a.u2
Stock-Based Compensation - Additional Information (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
shares
Dec. 31, 2019
USD ($)
plan
$ / shares
shares
Mar. 31, 2019
shares
Dec. 31, 2019
USD ($)
plan
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Jan. 01, 2020
shares
Jan. 01, 2019
shares
Jan. 30, 2014
shares
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Number of share-based employee compensation plans (in plans) | plan   2   2          
Common stock reserved for issuance (in shares)   14,178,107   14,178,107          
Compensation cost related to the nonvested awards not yet recognized | $   $ 35.5   $ 35.5          
Weighted average period for recognition of compensation cost       2 years 10 months 24 days          
Total unrecognized compensation cost related to unvested RSUs | $   $ 93.5   $ 93.5          
Unrecognized compensation cost period expected to be realized       2 years 1 month 6 days          
Restricted stock units | Maximum                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Vesting period       4 years          
Stock options                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Option to purchase common stock, outstanding (in shares)   4,373,895   4,373,895 4,057,788        
Weighted average exercise price (in dollars per share) | $ / shares   $ 34.24   $ 34.24 $ 27.23        
Vesting period       4 years          
Expiration period       10 years          
Weighted average grant date fair value (in dollars per share) | $ / shares       $ 28.49 $ 39.66 $ 19.65      
Aggregate intrinsic value of employee options exercised | $       $ 15.4 $ 54.0 $ 24.9      
Performance Restricted Stock Units                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Vesting period   3 years              
Vested (in shares)       0          
Granted (in shares)   1,275,955 186,433            
Performance Restricted Stock Units | Maximum                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Vesting period     2 years            
2008 Equity Incentive Plan                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Number of options or stock awards available for grant under the plan (in shares)                 0
Option to purchase common stock, outstanding (in shares)   1,124,450   1,124,450          
Weighted average exercise price (in dollars per share) | $ / shares   $ 5.66   $ 5.66          
Equity Incentive Plan 2014                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Shares authorized under the plan (in shares)   2,800,000   2,800,000          
Number of shares that may be added to the 2014 Plan (in shares)       5,943,348          
Period of annual automatic increase in the number of shares authorized       10 years          
Percentage applied on total number of shares of common stock outstanding on previous calendar year for automatic inclusion in the plan   5.00%   5.00%          
Common stock reserved for issuance (in shares)   5,296,333   5,296,333     3,175,011 2,896,365  
Option to purchase common stock, outstanding (in shares)   3,249,445   3,249,445          
Weighted average exercise price (in dollars per share) | $ / shares   $ 44.14   $ 44.14          
Equity Incentive Plan 2014 | Maximum                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Number of options or stock awards available for grant under the plan (in shares)   5,943,348   5,943,348          
Equity Incentive Plan 2014 | Restricted stock units                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Restricted stock units outstanding (in shares)   3,694,915   3,694,915          
Subsequent Event | Restricted stock units                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Granted (in shares) 1,700,000                
Subsequent Event | Performance Restricted Stock Units                  
Stock-based compensation expense included in the unaudited condensed consolidated statements of operations                  
Vesting period 3 years                
Granted (in shares) 1,900,000