Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2018	$ 385	$ 260,361	$ 34,984	$ (6,072)	$ (14,591)	$ 275,067
Balance, shares at Dec. 31, 2018	38,463				(1,484)
Net (loss) income			2,401			2,401
Other comprehensive (loss) income:
Foreign currency translation adjustment				(8,803)		(8,803)
Comprehensive (loss) income						(6,402)
Equity compensation	$ 2	7,037				7,039
Equity compensation, shares	251
Exercise of options	$ 3	3,054				3,057
Exercise of options, shares	306
Employee stock purchase plan	$ 1	1,462				1,463
Employee stock purchase plan, shares	61
Redemption and repurchase of stock to cover tax withholdings	$ (1)	(2,722)				(2,723)
Redemption and repurchase of stock to cover tax withholdings, shares	(93)
Balance at Sep. 30, 2019	$ 390	269,192	37,385	(14,875)	$ (14,591)	277,501
Balance, shares at Sep. 30, 2019	38,988				(1,484)
Balance at Jun. 30, 2019	$ 389	265,694	37,519	(6,858)	$ (14,591)	282,153
Balance, shares at Jun. 30, 2019	38,943				(1,484)
Net (loss) income			(134)			(134)
Other comprehensive (loss) income:
Foreign currency translation adjustment				(8,017)		(8,017)
Comprehensive (loss) income						(8,151)
Equity compensation		2,620				2,620
Equity compensation, shares	6
Exercise of options		53				53
Exercise of options, shares	5
Employee stock purchase plan	$ 1	884				885
Employee stock purchase plan, shares	36
Redemption and repurchase of stock to cover tax withholdings		(59)				(59)
Redemption and repurchase of stock to cover tax withholdings, shares	(2)
Balance at Sep. 30, 2019	$ 390	269,192	37,385	(14,875)	$ (14,591)	277,501
Balance, shares at Sep. 30, 2019	38,988				(1,484)
Balance at Dec. 31, 2019	$ 390	271,782	36,704	(8,589)	$ (14,591)	285,696
Balance, shares at Dec. 31, 2019	39,018				(1,484)
Net (loss) income			(13,224)			(13,224)
Other comprehensive (loss) income:
Foreign currency translation adjustment				8,669		8,669
Comprehensive (loss) income						(4,555)
Stock issued for Ascyrus Transaction	$ 10	19,990				20,000
Stock issued for Ascyrus Transaction, shares	992
Equity component of the convertible note issuance		16,426				16,426
Equity compensation	$ 3	7,885				7,888
Equity compensation, shares	273
Exercise of options	$ 1	517				518
Exercise of options, shares	47
Employee stock purchase plan		1,561				1,561
Employee stock purchase plan, shares	84
Redemption and repurchase of stock to cover tax withholdings	$ (1)	(1,767)				(1,768)
Redemption and repurchase of stock to cover tax withholdings, shares	(73)
Balance at Sep. 30, 2020	$ 403	316,394	23,480	80	$ (14,591)	325,766
Balance, shares at Sep. 30, 2020	40,341				(1,484)
Balance at Jun. 30, 2020	$ 393	293,022	26,350	(8,618)	$ (14,591)	296,556
Balance, shares at Jun. 30, 2020	39,288				(1,484)
Net (loss) income			(2,870)			(2,870)
Other comprehensive (loss) income:
Foreign currency translation adjustment				8,698		8,698
Comprehensive (loss) income						5,828
Stock issued for Ascyrus Transaction	$ 10	19,990				20,000
Stock issued for Ascyrus Transaction, shares	992
Equity compensation		2,518				2,518
Equity compensation, shares	6
Exercise of options		31				31
Exercise of options, shares	3
Employee stock purchase plan		873				873
Employee stock purchase plan, shares	54
Redemption and repurchase of stock to cover tax withholdings		(40)				(40)
Redemption and repurchase of stock to cover tax withholdings, shares	(2)
Balance at Sep. 30, 2020	$ 403	$ 316,394	$ 23,480	$ 80	$ (14,591)	$ 325,766
Balance, shares at Sep. 30, 2020	40,341				(1,484)