Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total		Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2017			18,788,000
Beginning balance at Dec. 31, 2017	$ 105,665		$ 188	$ 134,361	$ (4,417)	$ (11,317)	$ (13,150)
Beginning balance, treasury stock (in shares) at Dec. 31, 2017							(1,659,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(6,410)				(6,410)
Other comprehensive income (loss)	(2,135)	[1]				(2,135)
Stock-based compensation	2,452			2,452
Issuance of common stock under employee stock purchase plan (in shares)			17,000
Issuance of common stock under employee stock purchase plan	167			167
Sale of treasury stock (in shares)							377,000
Sale of treasury stock	4,464			1,478			$ 2,986
Exercise of stock options and issuance of restricted stock awards, net of forfeitures (in shares)			217,000
Exercise of stock options and issuance of restricted stock awards, net of forfeitures	275		$ 2	273
Ending balance (in shares) at Sep. 30, 2018			19,022,000
Ending balance at Sep. 30, 2018	101,730		$ 190	138,731	(13,575)	(13,452)	$ (10,164)
Ending balance, treasury stock (in shares) at Sep. 30, 2018							(1,282,000)
Beginning balance (in shares) at Jun. 30, 2018			18,937,000
Beginning balance at Jun. 30, 2018	102,431		$ 189	137,508	(12,401)	(12,701)	$ (10,164)
Beginning balance, treasury stock (in shares) at Jun. 30, 2018							(1,282,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(1,174)				(1,174)
Other comprehensive income (loss)	(751)	[1]				(751)
Stock-based compensation	860			860
Issuance of common stock under employee stock purchase plan (in shares)			17,000
Issuance of common stock under employee stock purchase plan	167			167
Exercise of stock options and issuance of restricted stock awards, net of forfeitures (in shares)			68,000
Exercise of stock options and issuance of restricted stock awards, net of forfeitures	197		$ 1	196
Ending balance (in shares) at Sep. 30, 2018			19,022,000
Ending balance at Sep. 30, 2018	$ 101,730		$ 190	138,731	(13,575)	(13,452)	$ (10,164)
Ending balance, treasury stock (in shares) at Sep. 30, 2018							(1,282,000)
Beginning balance (in shares) at Dec. 31, 2018	17,743,971		19,026,000
Beginning balance at Dec. 31, 2018	$ 99,515		$ 190	139,617	(15,397)	(14,731)	$ (10,164)
Beginning balance, treasury stock (in shares) at Dec. 31, 2018	(1,282,422)						(1,282,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ 36,738				36,738
Other comprehensive income (loss)	10,133	[1]				10,133
ASC 606 correction | Implementation of ASC 606	1,680				1,680
Stock-based compensation	3,019			3,019
Issuance of common stock under employee stock purchase plan (in shares)			45,000
Issuance of common stock under employee stock purchase plan	414			414
Exercise of stock options and issuance of restricted stock awards, net of forfeitures (in shares)			310,000
Exercise of stock options and issuance of restricted stock awards, net of forfeitures	$ 168		$ 4	164
Ending balance (in shares) at Sep. 30, 2019	18,098,586		19,381,000
Ending balance at Sep. 30, 2019	$ 151,667		$ 194	143,214	23,021	(4,598)	$ (10,164)
Ending balance, treasury stock (in shares) at Sep. 30, 2019	(1,282,422)						(1,282,000)
Beginning balance (in shares) at Jun. 30, 2019			19,320,000
Beginning balance at Jun. 30, 2019	$ 155,761		$ 193	141,856	27,365	(3,489)	$ (10,164)
Beginning balance, treasury stock (in shares) at Jun. 30, 2019							(1,282,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(4,344)				(4,344)
Other comprehensive income (loss)	(1,109)	[1]				(1,109)
ASC 606 correction | Implementation of ASC 606	0				0
Stock-based compensation	1,112			1,112
Issuance of common stock under employee stock purchase plan (in shares)			22,000
Issuance of common stock under employee stock purchase plan	196			196
Exercise of stock options and issuance of restricted stock awards, net of forfeitures (in shares)			39,000
Exercise of stock options and issuance of restricted stock awards, net of forfeitures	$ 51		$ 1	50
Ending balance (in shares) at Sep. 30, 2019	18,098,586		19,381,000
Ending balance at Sep. 30, 2019	$ 151,667		$ 194	$ 143,214	$ 23,021	$ (4,598)	$ (10,164)
Ending balance, treasury stock (in shares) at Sep. 30, 2019	(1,282,422)						(1,282,000)

[1] Tax impact was nominal for all periods.