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Share-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Number of Options
Outstanding, Beginning Balance	1,320,243
Granted	439,800
Exercised	(4,876)
Cancelled	(40,482)
Outstanding, Ending Balance	1,714,685	1,320,243
Exercisable as of March 31, 2020	299,571
Weighted Average Exercise Price
Weighted Average Exercise Price Outstanding, Beginning Balance	$ 3.34
Weighted Average Exercise Price, Granted	31.66
Weighted Average Exercise Price, Exercised	1.93
Weighted Average Exercise Price, Cancelled	2.87
Weighted Average Exercise Price Outstanding, Ending Balance	10.62	$ 3.34
Weighted Average Exercise Price, Exercisable as of March 31, 2020	$ 2.00
Weighted Average Remaining Contractual Term (In years)
Weighted Average Remaining Contractual Term (In years), Outstanding	9 years 2 months 15 days	9 years 2 months 23 days
Weighted Average Remaining Contractual Term (In years), Exercisable as of March 31, 2020	8 years 8 months 8 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value Outstanding	$ 28,115	$ 30,353
Aggregate Intrinsic Value, Exercisable as of March 31, 2020	$ 6,850

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

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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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