Consolidated Statements of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total accumulated other comprehensive loss	Nil Coupon Perpetual Loan Notes	Treasury Stock
Balance (in shares) at Dec. 31, 2017		24,133
Balance at beginning of period at Dec. 31, 2017	$ 34,172	$ 248	$ 138,760	$ (102,672)	$ (768)	$ 76	$ (1,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(216)			(216)
Foreign currency translation adjustments	416				416
Unrealized losses from marketable securities, net of tax	(1)				(1)
Stock compensation expense	(59)		(59)
Common shares issued upon vesting of restricted stock units (in shares)		45
Treasury shares withheld (in shares)		(10)
Treasury shares withheld	(10)						(10)
Adoption of ASC	205			205
Balance (in shares) at Mar. 31, 2018		24,168
Balance at end of period at Mar. 31, 2018	34,507	$ 248	138,701	(102,683)	(353)	76	(1,482)
Balance (in shares) at Dec. 31, 2017		24,133
Balance at beginning of period at Dec. 31, 2017	34,172	$ 248	138,760	(102,672)	(768)	76	(1,472)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(924)
Foreign currency translation adjustments	(441)
Unrealized losses from marketable securities, net of tax	(3)
Balance (in shares) at Sep. 30, 2018		24,170
Balance at end of period at Sep. 30, 2018	33,131	$ 248	138,894	(103,391)	(1,212)	76	(1,484)
Balance (in shares) at Mar. 31, 2018		24,168
Balance at beginning of period at Mar. 31, 2018	34,507	$ 248	138,701	(102,683)	(353)	76	(1,482)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,753)			(1,753)
Foreign currency translation adjustments	(594)				(594)
Unrealized losses from marketable securities, net of tax	(2)				(2)
Stock compensation expense	97		97
Common shares issued upon vesting of restricted stock units (in shares)		4
Common shares issued upon vesting of restricted stock units	(1)		(1)
Treasury shares withheld (in shares)		(2)
Treasury shares withheld	(2)						(2)
Balance (in shares) at Jun. 30, 2018		24,170
Balance at end of period at Jun. 30, 2018	32,252	$ 248	138,797	(104,436)	(949)	76	(1,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,045			1,045
Foreign currency translation adjustments	(263)				(263)
Unrealized losses from marketable securities, net of tax	0				0
Stock compensation expense	97		97
Balance (in shares) at Sep. 30, 2018		24,170
Balance at end of period at Sep. 30, 2018	33,131	$ 248	138,894	(103,391)	(1,212)	76	(1,484)
Balance (in shares) at Dec. 31, 2018		24,170
Balance at beginning of period at Dec. 31, 2018	34,052	$ 248	138,992	(102,495)	(1,285)	76	(1,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,289)			(1,289)
Foreign currency translation adjustments	104				104
Stock compensation expense	96		96
Common shares issued upon vesting of restricted stock units (in shares)		18
Common shares issued upon vesting of restricted stock units	0
Treasury shares withheld (in shares)		(2)
Treasury shares withheld	(2)						(2)
Adoption of ASC	22			22
Balance (in shares) at Mar. 31, 2019		24,186
Balance at end of period at Mar. 31, 2019	32,983	$ 248	139,088	(103,762)	(1,181)	76	(1,486)
Balance (in shares) at Dec. 31, 2018		24,170
Balance at beginning of period at Dec. 31, 2018	34,052	$ 248	138,992	(102,495)	(1,285)	76	(1,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,512)
Foreign currency translation adjustments	(276)
Unrealized losses from marketable securities, net of tax	0
Balance (in shares) at Sep. 30, 2019		24,186
Balance at end of period at Sep. 30, 2019	30,641	$ 248	139,349	(105,985)	(1,561)	76	(1,486)
Balance (in shares) at Mar. 31, 2019		24,186
Balance at beginning of period at Mar. 31, 2019	32,983	$ 248	139,088	(103,762)	(1,181)	76	(1,486)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(945)			(945)
Foreign currency translation adjustments	(43)				(43)
Stock compensation expense	123		123
Balance (in shares) at Jun. 30, 2019		24,186
Balance at end of period at Jun. 30, 2019	32,118	$ 248	139,211	(104,707)	(1,224)	76	(1,486)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,278)			(1,278)
Foreign currency translation adjustments	(337)				(337)
Unrealized losses from marketable securities, net of tax	0
Stock compensation expense	138		138
Balance (in shares) at Sep. 30, 2019		24,186
Balance at end of period at Sep. 30, 2019	$ 30,641	$ 248	$ 139,349	$ (105,985)	$ (1,561)	$ 76	$ (1,486)