Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Nil Coupon Perpetual Loan Notes	Treasury Stock
Balance (in Shares) at Dec. 31, 2012		22,102,000
Balance at Dec. 31, 2012	$ 84,236	$ 221	$ 133,498	$ (49,128)	$ (392)	$ 76	$ (39)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	5,101			5,101
Foreign currency translation adjustments	438				438
Unrealized (losses)/gains from marketable securities, net of tax	(9)				(9)
Exercise of stock options (in shares)		195,000
Exercise of stock options	811	$ 2	809
Tax benefit from stock compensation expense	67		67
Stock compensation expense	1,798		1,798
Tax effect of expired vested options	(121)		(121)
Common shares issued upon vesting of restricted stock units (in shares)		395,000
Common shares issued upon vesting of restricted stock units	(3,251)	$ 4	(3,255)
Treasury shares withheld (in shares)		(99,000)
Treasury shares withheld	(447)						(447)
Balance (in Shares) at Dec. 31, 2013		22,593,000
Balance at Dec. 31, 2013	88,623	$ 227	132,796	(44,027)	37	76	(486)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(17,725)			(17,725)
Foreign currency translation adjustments	(489)				(489)
Unrealized (losses)/gains from marketable securities, net of tax	4				4
Exercise of stock options (in shares)		60,000
Exercise of stock options	297		297
Tax benefit from stock compensation expense	7		7
Stock compensation expense	2,322		2,322
Tax effect of expired vested options	(379)		(379)
Common shares issued upon vesting of restricted stock units (in shares)		266,000
Common shares issued upon vesting of restricted stock units	$ (55)	$ 3	(58)
Treasury shares withheld (in shares)	(58,649)	(59,000)
Treasury shares withheld	$ (304)						(304)
Balance (in Shares) at Dec. 31, 2014		22,860,000
Balance at Dec. 31, 2014	72,301	$ 230	134,985	(61,752)	(448)	76	(790)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(12,380)			(12,380)
Foreign currency translation adjustments	(1,097)				(1,097)
Unrealized (losses)/gains from marketable securities, net of tax	(11)				(11)
Stock compensation expense	1,809		1,809
Issuance of Deferred Director's shares (in shares)		39,000
Issuance of Deferred Director's shares	(70)	$ 1	(71)
Tax effect of expired vested options	(908)		(908)
Common shares issued upon vesting of restricted stock units (in shares)		352,000
Common shares issued upon vesting of restricted stock units	$ (418)	$ 3	(421)
Treasury shares withheld (in shares)	(84,486)	(84,000)
Treasury shares withheld	$ (252)						(252)
Balance (in Shares) at Dec. 31, 2015		23,167,000
Balance at Dec. 31, 2015	$ 58,974	$ 234	$ 135,394	$ (74,132)	$ (1,556)	$ 76	$ (1,042)