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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
Options to purchase common stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, expired (in dollars per share) | $ / shares $ 15.36
Total unrecognized compensation costs $ 38.7
Unrecognized compensation costs, period for recognition (in years) 3 years
Unvested restricted stock units | Stock Option Plan Amended Restated 2007 Equity Incentive Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total unrecognized compensation costs $ 64.5
Unrecognized compensation costs, period for recognition (in years) 3 years