Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital [Member]	Accumulated deficit [Member]	Treasury stock [Member]	Non-controlling interest [Member]	Total
Balance at Dec. 31, 2014	$ 464	$ 548,304	$ (469,931)	$ (5,168)	$ 4,100	$ 77,769
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(4,591)	0	(34)	(4,625)
Equity contribution by non-controlling interest	0	0	0	0	5,802	5,802
Return of non-controlling interest contribution	0	0	0	0	(9,868)	(9,868)
Balance at Dec. 31, 2015	464	548,304	(474,522)	(5,168)	0	69,078
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(3,219)	0	0	(3,219)
Common stock repurchased for treasury						0
Balance at Dec. 31, 2016	$ 464	$ 548,304	$ (477,741)	$ (5,168)	$ 0	$ 65,859