CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]		Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2014	$ (55,601)	$ 94		$ 185,633	$ (241,328)
Balance (in shares) at Dec. 31, 2014		93,603,819
Issuance of common stock, net of issuance cost	6,101	$ 6		6,095
Issuance of common stock, net of issuance cost (in shares)		5,649,079
Share-based compensation related to stock options	1,273			1,273
Share-based compensation related to restricted stock award, net of forfeitures	529			529
Share-based compensation related to restricted stock award, net of forfeitures (in shares)		(2,501)
Exercise of options granted to employee	534		[1]	534
Exercise of options granted to employee (in shares)		550,000
Net loss from continuing operations	(27,282)				(27,282)
Net income loss from discontinued operations	85,319				85,319
Balance at Dec. 31, 2015	10,873	$ 100		194,064	(183,291)
Balance (in shares) at Dec. 31, 2015		99,800,397
Issuance of common stock, net of issuance cost	6,848	$ 24		6,824
Issuance of common stock, net of issuance cost (in shares)		23,846,735
Equity component of convertible notes	685			685
Share-based compensation related to stock options	920			920
Share-based compensation related to restricted stock award, net of forfeitures	68		[1]	68
Share-based compensation related to restricted stock award, net of forfeitures (in shares)		7,843
Exercise of options granted to employee	14		[1]	14
Exercise of options granted to employee (in shares)		479,110
Net loss from continuing operations	(29,176)				(29,176)
Net income loss from discontinued operations	(189)				(189)
Balance at Dec. 31, 2016	(9,957)	$ 124		202,575	(212,656)
Balance (in shares) at Dec. 31, 2016		124,134,085
Equity component of convertible notes	1,315			1,315
Share-based compensation related to stock options	337			337
Reclassification of embedded derivative	43,634			43,634
Convertible note conversions	18,654	$ 20		18,634
Convertible note conversions (in shares)		19,594,712
Net loss from continuing operations	(85,276)				(85,276)
Net income loss from discontinued operations
Balance at Dec. 31, 2017	$ (31,293)	$ 144		$ 266,495	$ (297,932)
Balance (in shares) at Dec. 31, 2017		143,728,797

[1] Represents an amount of less than $1 thousand.