Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock [Member]	Common Stock Subscribed [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Receivables from Stockholder [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2017	71,325,000	320,000					(200,000)
Balance at Dec. 31, 2017	$ 93		$ 609,829	$ (541,586)	$ (33)	$ (2,109)	$ (2,741)	$ 63,453
Net loss				(13,424)				(13,424)
Foreign currency translation adjustments					(18)			(18)
Stock-based compensation expense			1,048					$ 1,048
Issuance of common stock in connection with at-the-market offering, net of commissions and issuance costs (in shares)	1,537,000	(320,000)						1,537,528
Issuance of common stock in connection with at-the-market offering, net of commissions and issuance costs	$ 2		7,414			2,109		$ 9,525
Subscription of common stock in connection with at-the-market offering, net of commissions (in shares)		103,000
Subscription of common stock in connection with at-the-market offering, net of commissions			750			(750)
Balance (in shares) at Mar. 31, 2018	72,862,000	103,000					(200,000)
Balance at Mar. 31, 2018	$ 95		$ 619,041	(554,975)	$ (51)	$ (750)	$ (2,741)	60,619
Cumulative effect of ASU 2014-09 adoption				$ 35				$ 35