Stock-Based Employee Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]
Number of options, outstanding, December 31, 2021	8,786,724
Number of options, granted	0
Number of options, exercised	(197,527)
Number of options, forfeited	(73,103)
Number of options, expired	(11,969)
Number of options, outstanding, March 31, 2022	8,504,125	8,786,724
Number of options, exercisable, March 31, 2022	5,966,209
Number of options, expected to vest, March 31, 2022	2,537,916
Weighted-average exercise price per share, outstanding, December 31, 2021	$ 2.72
Weighted-average exercise price per share, granted	0
Weighted-average exercise price per share, exercised	2.08
Weighted-average exercise price per share, forfeited	5.11
Weighted-average exercise price per share, expired	4.29
Weighted-average exercise price per share, outstanding, March 31, 2022	2.71	$ 2.72
Weighted-average exercise price per share, exercisable, March 31, 2021	1.70
Weighted-average exercise price per share, expected to vest, March 31, 2021	$ 5.08
Intrinsic value, outstanding, December 31, 2021	$ 141,659
Intrinsic value, outstanding, March 31, 2022	102,896	$ 141,659
Intrinsic value, exercisable, March 31, 2022	78,203
Intrinsic value, expected to vest, March 31, 2022	$ 24,693
Weighted Average Remaining Contractual Term, Outstanding	6 years 9 months 7 days	7 years 10 days
Weighted Average Remaining Contractual Term, Exercisable	6 years 1 month 28 days
Weighted Average Remaining Contractual Term, Expected to Vest	8 years 2 months 12 days

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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