CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Common Stock in Treasury
Beginning Balance (in shares) at Dec. 31, 2018			17,253,011
Beginning Balance at Dec. 31, 2018	$ 376,609		$ 19	$ 251,329	$ 175,353		$ (18,483)	$ (31,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	152				152
Currency translation adjustment	(1,564)						(1,564)
Stock-based compensation	2,564			2,564
Common stock issued, net of shares withheld for employee taxes (in shares)			64,864
Common stock issued, net of shares withheld for employee taxes	(846)			(1,053)				207
Ending Balance (in shares) at Mar. 31, 2019			17,317,875
Ending Balance at Mar. 31, 2019	376,588		$ 19	252,840	175,178		(20,047)	(31,402)
Beginning Balance (in shares) at Dec. 31, 2018			17,253,011
Beginning Balance at Dec. 31, 2018	376,609		$ 19	251,329	175,353		(18,483)	(31,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(12,452)
Currency translation adjustment	(5,947)
Ending Balance (in shares) at Sep. 30, 2019			17,404,087
Ending Balance at Sep. 30, 2019	367,525		$ 19	260,737	162,574		(24,430)	(31,375)
Beginning Balance (in shares) at Mar. 31, 2019			17,317,875
Beginning Balance at Mar. 31, 2019	376,588		$ 19	252,840	175,178		(20,047)	(31,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6,405)				(6,405)
Currency translation adjustment	1,263						1,263
Stock-based compensation	2,752			2,752
Common stock issued, net of shares withheld for employee taxes (in shares)			21,187
Common stock issued, net of shares withheld for employee taxes	141			114				27
Ending Balance (in shares) at Jun. 30, 2019			17,339,062
Ending Balance at Jun. 30, 2019	$ 374,339		$ 19	255,706	168,773		(18,784)	(31,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201409Member
Net income (loss)	$ (6,199)				(6,199)
Currency translation adjustment	(5,646)						(5,646)
Stock-based compensation	3,387			3,387
Common stock issued, net of shares withheld for employee taxes (in shares)			65,025
Common stock issued, net of shares withheld for employee taxes	1,644			1,644
Ending Balance (in shares) at Sep. 30, 2019			17,404,087
Ending Balance at Sep. 30, 2019	$ 367,525		$ 19	260,737	162,574		(24,430)	(31,375)
Beginning Balance (in shares) at Dec. 31, 2019	17,576,618		17,576,618
Beginning Balance at Dec. 31, 2019	$ 331,992	$ (327)	$ 19	267,868	112,879	$ (327)	(17,399)	(31,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(14,823)				(14,823)
Currency translation adjustment	(3,778)						(3,778)
Stock-based compensation	2,178			2,178
Common stock issued, net of shares withheld for employee taxes (in shares)			141,561
Common stock issued, net of shares withheld for employee taxes	1,221			894				327
Ending Balance (in shares) at Mar. 31, 2020			17,718,179
Ending Balance at Mar. 31, 2020	$ 316,790		$ 19	270,940	98,056		(21,177)	(31,048)
Beginning Balance (in shares) at Dec. 31, 2019	17,576,618		17,576,618
Beginning Balance at Dec. 31, 2019	$ 331,992	$ (327)	$ 19	267,868	112,879	$ (327)	(17,399)	(31,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(26,779)
Currency translation adjustment	$ (1,127)
Ending Balance (in shares) at Sep. 30, 2020	18,988,379		17,832,934
Ending Balance at Sep. 30, 2020	$ 313,330		$ 19	276,779	86,100		(18,526)	(31,042)
Beginning Balance (in shares) at Mar. 31, 2020			17,718,179
Beginning Balance at Mar. 31, 2020	316,790		$ 19	270,940	98,056		(21,177)	(31,048)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(8,932)				(8,932)
Currency translation adjustment	(1,688)						(1,688)
Stock-based compensation	2,167			2,167
Common stock issued, net of shares withheld for employee taxes (in shares)			51,401
Common stock issued, net of shares withheld for employee taxes	224			218				6
Ending Balance (in shares) at Jun. 30, 2020			17,769,580
Ending Balance at Jun. 30, 2020	308,561		$ 19	273,325	89,124		(22,865)	(31,042)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,024)				(3,024)
Currency translation adjustment	4,339						4,339
Stock-based compensation	2,083			2,083
Common stock issued, net of shares withheld for employee taxes (in shares)			63,354
Common stock issued, net of shares withheld for employee taxes	$ 1,371			1,371
Ending Balance (in shares) at Sep. 30, 2020	18,988,379		17,832,934
Ending Balance at Sep. 30, 2020	$ 313,330		$ 19	$ 276,779	$ 86,100		$ (18,526)	$ (31,042)