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Share-Based Compensation - Share Options Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Number of Options
Beginning balance (shares)	5,936,239
Granted (shares)	96,500
Exercised (shares)	(14,976)
Canceled or forfeited (shares)	(102,814)
Ending balance (shares)	5,914,949	5,936,239
Exercisable (shares)	1,735,080
Vested and expected to vest (shares)	5,914,949
Weighted-Average Exercise Price
Beginning balance weighted average exercise price (usd per share)	$ 17.71
Granted weighted average exercise price (usd per share)	8.81
Exercised weighted average exercise price (usd per share)	1.77
Canceled or forfeited weighted average exercise price (usd per share)	24.62
Ending balance weighted average exercise price (usd per share)	17.49	$ 17.71
Exercisable weighted average exercise price (usd per share)	17.48
Vested and expected to vest weighted average exercise price (usd per share)	$ 17.49
Weighted average contractual term outstanding (years)	8 years 9 months 14 days	9 years 7 days
Weighted average contractual term exercisable (years)	8 years 2 months 1 day
Weighted average contractual term vested and expected to vest (years)	8 years 9 months 14 days
Options outstanding (aggregate intrinsic value)	$ 2,885	$ 11,873
Options exercisable (aggregate intrinsic value)	2,013
Options vested and expected to vest (aggregate intrinsic value)	$ 2,885

X

- Definition

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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Weighted average price of options that were either forfeited or expired.

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

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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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