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Stock-Based Compensation - Status of Our Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Outstanding, beginning balance (in shares)	3,785,941	5,318,759	6,839,417
Granted (in shares)	1,232,056	845,120	969,720
Exercised (in shares)	(1,372,564)	(2,310,934)	(2,309,451)
Forfeited (in shares)	(684,238)	(67,004)	(180,927)
Outstanding, ending balance (in shares)	2,961,195	3,785,941	5,318,759
Exercisable (in shares)	1,668,356
Weighted Average Exercise Price
Outstanding , beginning balance (in dollars per share)	$ 15.21	$ 9.97	$ 7.63
Granted (in dollars per share)	42.13	28.33	19.70
Exercised (in dollars per share)	9.97	7.96	6.83
Forfeited (in dollars per share)	29.70	16.37	13.34
Outstanding, ending balance (in dollars per share)	25.46	$ 15.21	$ 9.97
Weighted average exercise price, exercisable (in dollars per share)	$ 15.29

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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