Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 31, 2016	70,390				(200)
Balance at Dec. 31, 2016	$ 92	$ 598,069	$ (490,573)	$ (85)	$ (2,741)	$ 104,762
Net loss			(48,348)			(48,348)
Foreign currency translation adjustments				51		51
Return of purchase premium for noncontrolling interest		21				21
Stock-based compensation expense		3,124				$ 3,124
Exercise of stock options (in shares)	80					80
Exercise of stock options		470				$ 470
Balance (in shares) at Sep. 30, 2017	70,470				(200)
Balance at Sep. 30, 2017	$ 92	$ 601,684	$ (538,921)	$ (34)	$ (2,741)	$ 60,080