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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Stock-based compensation - Restricted Stock - (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted stock disclosures
Stock-based compensation.	$ 9,344	$ 11,324	$ 14,934
Unvested restricted common stock units
Shares
Balance, beginning (in shares)	806,379
Granted (in shares)	964,480
Vested (in shares)	(436,611)
Forfeited (in shares)	(221,685)
Balance, ending (in shares)	1,112,563	806,379
Weighted Average Grant Date Fair Value Per Share
Balance, beginning (in dollars per share)	$ 7.26
Granted (in dollars per share)	4.29
Vested (in dollars per share)	6.92
Forfeited (in dollars per share)	5.05
Balance, ending (in dollars per share)	$ 5.27	$ 7.26
Restricted stock disclosures
Stock-based compensation.	$ 3,215	$ 3,551	3,110
Unrecognized stock-based compensation expense	$ 3,700
Remaining weighted-average remaining vesting period	1 year 10 months 24 days
Share-based Payment Arrangement, Employee \| Unvested restricted common stock units
Restricted stock disclosures
Stock-based compensation.	$ 2,900	$ 3,300	$ 2,800
Vesting period, tranche one \| Unvested restricted common stock units
Shares
Granted (in shares)	864,480
Restricted stock disclosures
Vesting period	3 years
Vesting period, tranche two \| Unvested restricted common stock units
Shares
Granted (in shares)	100,000
Restricted stock disclosures
Vesting period	4 years