Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Shares [Member]	Treasury Stock [Member]	Warrants [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2013	$ 167,317	$ 3,734			$ 542,091	$ (64,985)	$ (313,523)
Beginning balance, shares at Dec. 31, 2013		37,340,000
Issuance of common shares	23,850	$ 322			23,528
Issuance of common shares (in shares)		3,219,000
Contingent payment event	4,188				4,188
Issuance of warrants				$ 233
Issuance of restricted stock units		$ 15			(15)
Issuance of restricted stock units, shares		149,000
Tax withholding on restricted stock units	(76)				(76)
Share-based compensation	1,434				1,434
Foreign currency translation adjustment	(14,325)					(14,325)
Net income (loss)	29,076						29,076
Ending balance at Dec. 31, 2014	211,464	$ 4,071		233	571,150	(79,310)	(284,447)
Ending balance, shares at Dec. 31, 2014		40,708,000
Contingent payment event	(4,188)				(4,188)
Issuance of warrants				466
Issuance of restricted stock units	1,137	$ 31			1,106
Issuance of restricted stock units, shares		310,000
Tax withholding on restricted stock units	(391)				(391)
Repurchase of treasury stock	(970)		$ (970)
Repurchase of treasury stock, shares			333,000
Share-based compensation	1,688				1,688
Foreign currency translation adjustment	(42,280)					(42,280)
Net income (loss)	(107,538)						(107,538)
Ending balance at Dec. 31, 2015	$ 58,922	$ 4,102	$ (970)	699	569,365	(121,590)	(391,985)
Ending balance, shares at Dec. 31, 2015	41,017,777	41,018,000	333,000
Issuance of common shares	$ 3,970	$ 600			3,370
Issuance of common shares (in shares)		5,998,000
Issuance of restricted stock units		$ 20			(20)
Issuance of restricted stock units, shares		204,000
Tax withholding on restricted stock units	(66)				(66)
Share-based compensation	629				629
Foreign currency translation adjustment	(18,726)					(18,726)
Net income (loss)	(6,243)						(6,243)
Ending balance at Dec. 31, 2016	$ 38,486	$ 4,722	$ (970)	$ 699	$ 573,278	$ (140,316)	$ (398,228)
Ending balance, shares at Dec. 31, 2016	47,220,525	47,220,000	333,000