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, 2013	$ (26,946)	$ 93		$ 184,346	$ (211,385)
Balance (in shares) at Dec. 31, 2013		93,551,098
Share-based compensation related to stock options	467			467
Share-based compensation related to restricted stock award, net of forfeitures	775			775
Share-based compensation related to restricted stock award, net of forfeitures (in shares)		(81,209)
Exercise of options granted to employees	46	$ 1		45
Exercise of options granted to employees (in shares)		133,930
Net loss from continuing operations	(33,298)				(33,298)
Net income (loss) from discontinued operations	3,355				3,355
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	6,101	$ 6		6,095
Issuance of common stock (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 employees	534		[1]	534
Exercise of options granted to employees (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	6,848	$ 24		6,824
Issuance of common stock (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 employees	14		[1]	14
Exercise of options granted to employees (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

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