Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ 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	320					(200)
Balance at Dec. 31, 2017	$ 93		$ 609,829	$ (541,586)	$ (33)	$ (2,109)	$ (2,741)	$ 63,453
Net loss				(28,596)				(28,596)
Foreign currency translation adjustments					(56)			(56)
Stock-based compensation expense			3,178					3,178
Issuance of common stock in connection with at-the-market offering, net of commissions and issuance costs (in shares)	3,634	(320)
Issuance of common stock in connection with at-the-market offering, net of commissions and issuance costs	$ 4		22,702			2,109		24,815
Balance (in shares) at Jun. 30, 2018	74,959						(200)
Balance at Jun. 30, 2018	$ 97		$ 635,709	(570,147)	$ (89)		$ (2,741)	62,829
Cumulative effect of ASU 2014-09 adoption				$ 35				$ 35