CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common stock	Common stock IPO	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2019		61,321,424
Beginning Balance at Dec. 31, 2019	$ 469,873	$ 613		$ 486,065	$ 21	$ (16,826)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	5,671			5,671
Foreign currency translation adjustments	47				47
Net income	(14,564)					(14,564)
Ending Balance (in shares) at Sep. 30, 2020		61,321,424
Ending Balance at Sep. 30, 2020	461,027	$ 613		491,736	68	(31,390)
Beginning Balance (in shares) at Jun. 30, 2020		61,321,424
Beginning Balance at Jun. 30, 2020	460,906	$ 613		489,991	40	(29,738)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,745			1,745
Foreign currency translation adjustments	28				28
Net income	(1,652)					(1,652)
Ending Balance (in shares) at Sep. 30, 2020		61,321,424
Ending Balance at Sep. 30, 2020	461,027	$ 613		491,736	68	(31,390)
Beginning Balance (in shares) at Dec. 31, 2020		61,321,424
Beginning Balance at Dec. 31, 2020	470,150	$ 613		492,747	78	(23,288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	3,166			3,166
Foreign currency translation adjustments	(45)				(45)
Issuance of common stock to board of director member (in shares)		25,200
Issuance of common stock to a board of directors member	250			250
Issuance of common stock in initial public offering, net of issuance costs of $17.7 million (in shares)		8,152	11,666,667
Issuance of common stock in initial public offering, net of issuance costs of $17.2 million	$ 146,136	$ 117		146,019
Exercise of vested stock options (in shares)	172,728	172,728
Exercise of vested stock options	$ 1,359	$ 3		1,356
Dividend	(74,500)			(74,500)
Net income	(10,391)					(10,391)
Ending Balance (in shares) at Sep. 30, 2021		73,194,171
Ending Balance at Sep. 30, 2021	536,125	$ 733		569,038	33	(33,679)
Beginning Balance (in shares) at Jun. 30, 2021		73,013,291
Beginning Balance at Jun. 30, 2021	530,020	$ 730		566,589	66	(37,365)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,093			1,093
Foreign currency translation adjustments	(33)				(33)
Issuance of common stock in initial public offering, net of issuance costs of $17.7 million (in shares)		8,152
Exercise of vested stock options (in shares)		172,728
Exercise of vested stock options	1,359	$ 3		1,356
Net income	3,686					3,686
Ending Balance (in shares) at Sep. 30, 2021		73,194,171
Ending Balance at Sep. 30, 2021	$ 536,125	$ 733		$ 569,038	$ 33	$ (33,679)