Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2018	$ 276	$ 303,015	$ (80,762)	$ (8,523)	$ 214,006
Exercise of share options	2	1,800			1,802
Share-based compensation expense		845			845
Tax on vesting of restricted share units		(145)			(145)
Other comprehensive income (loss),				1,167	1,167
Net loss			(1,496)		(1,496)
Balance at Mar. 31, 2019	278	305,515	(82,258)	(7,356)	216,179
Balance at Dec. 31, 2019	276	304,909	(84,033)	(7,461)	213,691
Exercise of share options		1			1
Share-based compensation expense		957			957
Tax on vesting of restricted share units		(155)			(155)
Other comprehensive income (loss),				(2,727)	(2,727)
Ordinary shares repurchased	(4)	(6,138)	(1,590)		(7,732)
Net loss			(6,027)		(6,027)
Balance at Mar. 31, 2020	$ 272	$ 299,574	$ (91,650)	$ (10,188)	$ 198,008