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Gross number of share options (or share units) granted during the period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended						9 Months Ended		81 Months Ended
	Oct. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Stock-Based Compensation
Shares issued under the Employee Stock Purchase Plan (in shares)		$ 404	$ 309	$ 249	$ 309	$ 257	$ 224
Fair value of restricted stock units withheld for payment of taxes		$ 57	$ 61	$ 1,501			$ 163
Prior Plans
Stock-Based Compensation
Awards available for future grant under the Plan (in shares)		0						0		0
Omnibus Incentive Plan 2019
Stock-Based Compensation
Awards available for future grant under the Plan (in shares)		2,730,746						2,730,746		2,730,746
Stock options
Stock-Based Compensation
Expiration period								10 years
Vesting period								4 years
Granted (in shares)		189,882			28,000			1,663,954	1,324,890
Weighted average grant-date fair value (in dollars per share)		$ 35.65			$ 10.81			$ 33.03	$ 8.70
Stock options \| Nonemployee directors
Stock-Based Compensation
Expiration period								10 years
Stock options \| Nonemployee directors \| Minimum
Stock-Based Compensation
Vesting period								1 year
Stock options \| Nonemployee directors \| Maximum
Stock-Based Compensation
Vesting period								3 years
Employee stock
Stock-Based Compensation
Common stock available for issuance (in shares)		1,000,000						1,000,000		1,000,000
Common stock granted since inception (in shares)										736,375
Shares issued under the Employee Stock Purchase Plan (in shares)		$ 300
Employee stock \| Subsequent event
Stock-Based Compensation
Shares purchased during period (in shares)	7,102
Restricted stock units
Stock-Based Compensation
Vesting period								4 years
Restricted stock units granted (shares)		22,310			0			263,364	196,836
Weighted-average grant date fair value (in usd per share)		$ 54.35						$ 52.19	$ 11.41
Grant-date fair value of restricted stock units granted		$ 1,200			$ 0			$ 13,700	$ 2,200
Shares vested in period (shares)		2,826						62,259	32,840
Restricted stock withheld for employee tax remittance (in shares)		1,174						30,588	13,872
Fair value of vested restricted stock awards		$ 200			$ 0			$ 5,100	$ 600
Fair value of restricted stock units withheld for payment of taxes		$ 100						$ 1,600	$ 200
Restricted stock units \| Nonemployee directors \| Minimum
Stock-Based Compensation
Vesting period								1 year
Restricted stock units \| Nonemployee directors \| Maximum
Stock-Based Compensation
Vesting period								3 years