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Stock-Based Compensation - Summary of 2009 ESPP (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average per share discount from market value for shares purchased (in dollars per share)	$ 50.58	$ 22.97	$ 17.83
The 2009 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased pursuant to 2009 ESPP	103,374
Weighted average per share price of shares purchased (in dollars per share)	$ 286.61
Weighted average per share discount from market value for shares purchased (in dollars per share)	$ 50.58
Shares available for purchase pursuant to 2009 ESPP	1,309,353

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The weighted average discount per share for compensation expense recognized under the 2009 ESPP.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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Number of shares issued under share-based payment arrangement.

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