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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Options [Member]
Number of Shares
Outstanding	6,679,581	5,757,305
Granted	1,789,000	1,544,850
Exercised	(855,717)	(544,565)
Forfeited	(56,475)	(78,009)
Expired	(2,084)
Outstanding	7,554,305	6,679,581	5,757,305
Vested (exercisable)	5,862,122
Expected to vest after (unexercisable)	1,692,183
Weighted-Average Exercise Price/Share
Outstanding	$ 7.14	$ 5.16
Granted	20.46	13.55
Exercised	6.73	3.91
Forfeited	13.39	10.66
Expired	19.56
Outstanding	10.29	7.14	$ 5.16
Vested (exercisable)	7.41
Expected to vest after (unexercisable)	$ 20.24
Weighted-Average Remaining Contractual Term (Years)
Outstanding	6 years 7 months 6 days
Vested (exercisable)	5 years 10 months 24 days
Expected to vest after (unexercisable)	9 years 2 months 12 days
Aggregated Intrinsic Value
Outstanding	$ 254,393,000
Vested (exercisable)	213,769,400
Expected to vest after (unexercisable)	$ 40,623,600
Weighted-average fair value per share	$ 13.21	$ 13.55
Warrants [Member]
Number of Shares
Outstanding	1,001,028	2,049,534
Granted	0		0
Exercised	(963,149)	(1,027,546)
Expired	(37,879)	(20,960)
Outstanding		1,001,028	2,049,534
Weighted-Average Exercise Price/Share
Outstanding	$ 3.83	$ 4.03
Granted	0		$ 0
Exercised	3.80	3.95
Expired	$ 4.58	17.78
Outstanding		$ 3.83	$ 4.03
Weighted-Average Remaining Contractual Term (Years)
Outstanding	0 years
Vested (exercisable)	0 years

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

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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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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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Amount by which current fair value of underlying stock exceeds exercise price of 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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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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