Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		63 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020
Stock-Based Compensation
Shares issued under the Employee Stock Purchase Plan (in shares)		$ 224	$ 218
Employee stock
Stock-Based Compensation
Common stock available for issuance (in shares)		1,000,000		1,000,000
Common stock granted since inception (in shares)				628,770
Employee stock | Subsequent event
Stock-Based Compensation
Shares purchased during period (in shares)	32,971
Shares issued under the Employee Stock Purchase Plan (in shares)	$ 200
Service-based stock options
Stock-Based Compensation
Expiration period		10 years
Vesting period		4 years
Granted (in shares)		1,186,140
Weighted average grant-date fair value (in dollars per share)		$ 8.64	$ 12.82
Service-based stock options | Nonemployee directors
Stock-Based Compensation
Expiration period		10 years
Vesting period		1 year
Restricted Stock Units (RSUs)
Stock-Based Compensation
Vesting period		4 years
Restricted stock units granted (shares)		186,136	176,422
Weighted-average grant date fair value (in usd per share)		$ 11.24	$ 17.77
Grant-date fair value of restricted stock units granted		$ 2,100	$ 3,100
Shares vested in period (shares)		36,212
Restricted stock withheld for employee tax remittance (in shares)		13,872
Restricted Stock Units (RSUs) | Nonemployee directors
Stock-Based Compensation
Vesting period		1 year
Prior Plans
Stock-Based Compensation
Awards available for future grant under the Plan (in shares)		0		0
Omnibus Incentive Plan 2019
Stock-Based Compensation
Awards available for future grant under the Plan (in shares)		1,959,142		1,959,142