Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2013	$ 188	$ 183,967	$ (99,655)	$ (3,748)	$ 80,752
Exercise of share options	1	13			14
Issuance of shares from option plan	3	(3)
Issuance of shares from exercise of warrants		318			318
Share-based compensation expense		2,521			2,521
Other comprehensive loss				(822)	(822)
Net loss			(22,174)		(22,174)
Balance at Dec. 31, 2014	192	186,816	(121,829)	(4,570)	60,609
Exercise of share options	1	19			20
Share-based compensation expense		3,485			3,485
Other comprehensive loss				(707)	(707)
Net loss			(24,478)		(24,478)
Balance at Dec. 31, 2015	243	244,033	(146,307)	(5,277)	92,692
Issuance of shares in secondary offering	50	53,713			53,763
Exercise of share options		76			76
Share-based compensation expense		5,019			5,019
Other comprehensive loss				(2,474)	(2,474)
Net loss			(22,349)		(22,349)
Balance at Dec. 31, 2016	$ 243	$ 249,128	$ (168,656)	$ (7,751)	$ 72,964