CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Cumulative effect of a change in accounting	Adjusted Balance	Common Stock	Common Stock Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Adjusted Balance	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Adjusted Balance	Accumulated Deficit	Accumulated Deficit Cumulative effect of a change in accounting	Accumulated Deficit Adjusted Balance	Treasury Stock	Treasury Stock Adjusted Balance
Beginning balance (in shares) at Dec. 31, 2018				36,921,000	36,921,000
Beginning balance at Dec. 31, 2018	$ (21,924)	$ 1,547	$ (20,377)	$ 371	$ 371	$ 343,955	$ 343,955	$ (4,531)	$ (4,531)	$ (361,023)	$ 1,547	$ (359,476)	$ (696)	$ (696)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,525									27,525
Share-based compensation expense	13,414					13,414
Issuance in connection with the exercise of stock options (in shares)				104,000
Issuance in connection with the exercise of stock options	1,099			$ 1		1,098
Issuance of common stock upon vesting of restricted stock units (in shares)				435,000
Issuance of common stock upon vesting of restricted stock units				$ 4		(4)
Effect of shares withheld to cover taxes	(4,137)					(4,137)
Total other comprehensive income (loss)	(8,020)							(8,020)
Ending balance (in shares) at Dec. 31, 2019				37,460,000	37,460,000
Ending balance at Dec. 31, 2019	9,504	$ (239)	$ 9,265	$ 376	$ 376	354,326	$ 354,326	(12,551)	$ (12,551)	(331,951)	$ (239)	$ (332,190)	(696)	$ (696)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	38,192									38,192
Share-based compensation expense	$ 18,448					18,448
Issuance in connection with the exercise of stock options (in shares)	7,193			7,000
Issuance in connection with the exercise of stock options	$ 92					92
Issuance of common stock upon vesting of restricted stock units (in shares)				712,000
Issuance of common stock upon vesting of restricted stock units	0			$ 7		(7)
Effect of shares withheld to cover taxes	(7,356)					(7,356)
Total other comprehensive income (loss)	$ (7,664)							(7,664)
Ending balance (in shares) at Dec. 31, 2020	38,178,975			38,179,000
Ending balance at Dec. 31, 2020	$ 50,977			$ 383		365,503		(20,215)		(293,998)			(696)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41,982									41,982
Share-based compensation expense	$ 12,297					12,297
Issuance in connection with the exercise of stock options (in shares)	240,129			129,000
Issuance in connection with the exercise of stock options	$ 524			$ 2		522
Issuance of common stock upon vesting of restricted stock units (in shares)				441,000
Issuance of common stock upon vesting of restricted stock units	0			$ 4		(4)
Effect of shares withheld to cover taxes	(4,674)					(4,674)
Total other comprehensive income (loss)	$ 9,065							9,065
Ending balance (in shares) at Dec. 31, 2021	38,748,617			38,749,000
Ending balance at Dec. 31, 2021	$ 110,171			$ 389		$ 373,644		$ (11,150)		$ (252,016)			$ (696)