Stock-Based Compensation - Stock Option Activity (Details)	9 Months Ended
Sep. 30, 2020 USD ($) $ / shares shares
Stock Options [Member]
Number of Shares
Outstanding \| shares	6,679,581
Granted \| shares	1,675,300
Exercised \| shares	(678,488)
Forfeited \| shares	(45,011)
Expired \| shares	(2,084)
Outstanding \| shares	7,629,298
Vested (exercisable) \| shares	5,819,639
Expected to vest after (unexercisable) \| shares	1,809,659
Weighted-Average Exercise Price/Share
Outstanding	$ 7.14
Granted	18.57
Exercised	6.90
Forfeited	10.17
Expired	20.49
Outstanding	9.65
Vested (exercisable)	7.06
Expected to vest after (unexercisable)	$ 17.97
Weighted-Average Remaining Contractual Term (Years)
Outstanding	6 years 9 months 18 days
Vested (exercisable)	6 years 1 month 6 days
Expected to vest after (unexercisable)	9 years 4 months 24 days
Aggregated Intrinsic Value
Outstanding \| $	$ 288,091,500
Vested (exercisable) \| $	234,778,400
Expected to vest after (unexercisable) \| $	$ 53,249,600
Weighted-average fair value per share	$ 11.88
Warrants [Member]
Number of Shares
Outstanding \| shares	1,001,028
Exercised \| shares	(963,149)
Expired \| shares	(37,879)
Weighted-Average Exercise Price/Share
Outstanding	$ 3.83
Exercised	3.80
Expired	$ 4.58
Weighted-Average Remaining Contractual Term (Years)
Outstanding	0 years
Vested (exercisable)	0 years

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

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Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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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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 exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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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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