Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued in connection with employee stock purchase plan (in shares)	27,826,000
Restricted stock granted, weighted average fair value (in USD per share)	$ 77.53
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 35.7
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted-average period of recognition for unrecognized compensation expense	2 years 9 months 18 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted, weighted average fair value (in USD per share)	$ 77.53	$ 59.45

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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