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Equity-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2019
Equity-based Compensation
Weighted-average grant date fair value (in dollars per share)			$ 1.79
Aggregate grant date fair value (in dollars per share)	$ 3		$ 14
Options granted (in shares)	0		67,232
Fair value of options granted			$ 121
Fair value of options vested	$ 83		$ 383
Options exercised (in shares)	4,996		25,783
Intrinsic value of stock options exercised	$ 26		$ 140
Compensation expense recognized	72	$ 129	264	$ 342
Unrecognized compensation expense	887		887
Performance-based awards | Executive
Equity-based Compensation
Options granted (in shares)					349,150
Compensation expense recognized			0
Unrecognized compensation expense	$ 254		$ 254

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- Definition

The aggregate grant-date fair value of options granted during the reporting period.

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