Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock [Member] Common Class A [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017	95,943,409
Balance at Dec. 31, 2017	$ 96	$ 112,045	$ 6	$ (95,311)	$ 16,836
Stock-based compensation		210			210
Unrealized loss on investments			(9)		(9)
Net loss				(6,443)	(6,443)
Balance (in shares) at Mar. 31, 2018	95,943,409
Balance at Mar. 31, 2018	$ 96	$ 111,863	$ (3)	$ (101,754)	$ 10,596