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Stock-Based Compensation - Stock Option Activity (Details) - Stock Options [Member]	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Number of Shares
Outstanding - December 31, 2020 | shares	7,554,305
Granted (weighted-average fair value of $32.73 per share) | shares	529,935
Exercised | shares	(701,360)
Forfeited | shares	(24,765)
Outstanding - June 30, 2021 | shares	7,358,115
Vested (exercisable) - June 30, 2021 | shares	5,738,698
Expected to vest after June 30, 2021 (unexercisable) | shares	1,619,417
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 32.73
Weighted-Average Exercise Price/Share
Outstanding - December 31, 2020	10.29
Granted (weighted-average fair value of $32.66 per share)	56.47
Exercised	8.54
Forfeited	34.65
Outstanding - June 30, 2021	13.70
Vested (exercisable) - June 30, 2021	8.84
Expected to vest after June 30, 2021 (Unexercisable)	$ 30.92
Weighted-Average Remaining Contractual Term (Years)
Outstanding - June 30, 2021	6 years
Vested (exercisable) - June 30, 2021	5 years 6 months
Expected to vest after June 30, 2021 (unexercisable)	8 years
Aggregated Intrinsic Value
Outstanding - June 30, 2021 | $	$ 388,699
Vested (exercisable) - June 30, 2021 | $	330,966
Expected to vest after June 30, 2021 (unexercisable) | $	$ 57,643

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Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract].

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Number of fully vested and expected to vest exercisable options that may 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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