Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income	Treasury Stock	Accumulated Deficit	Total
Balance at Dec. 31, 2013	$ 1,064	$ 831,156	$ 898	$ (1,552)	$ (849,437)	$ (17,871)
Balance (in shares) at Dec. 31, 2013	106,356,558			165,906
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company					(88,488)	(88,488)
Stock based compensation	$ 2	4,051				4,053
Stock based compensation (in shares)	146,174
Stock dividend		156			(156)
Stock dividend (in shares)	34,232
Public offering, common stock, net	$ 365	153,584				$ 153,949
Public offering, common stock, net (in shares)	36,502,440					36,502,440
Stock option exercises	$ 6	401		$ (770)		$ (363)
Stock option exercises (in shares)	634,519			125,819
Exercise of warrants	$ 239	101,886		$ (340)		$ 101,785
Exercise of warrants (in shares)	23,918,429			86,391		23,832,038
Shares issued for acquisition	$ 5	3,995				$ 4,000
Shares issued for acquisition (in shares)	530,504
Conversion of preferred stock	$ 55	1,163				1,218
Shares issued upon conversion of redeemable stock (in shares)	5,521,676
Balance at Dec. 31, 2014	$ 1,736	1,096,392	898	$ (2,662)	(938,081)	158,283
Balance (in shares) at Dec. 31, 2014	173,644,532			378,116
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company					(55,690)	(55,690)
Other comprehensive income			(100)			(100)
Stock based compensation	$ 1	7,816				7,817
Stock based compensation (in shares)	89,490
Stock dividend	$ 1	104			(105)
Stock dividend (in shares)	47,553
Stock option exercises	$ 4	163		$ (247)		(80)
Stock option exercises (in shares)	364,448			101,837
Exercise of warrants		47				$ 47
Exercise of warrants (in shares)	26,882					26,882
Shares issued for acquisition	$ 64	14,395				$ 14,459
Shares issued for acquisition (in shares)	6,394,539
Balance at Dec. 31, 2015	$ 1,806	1,118,917	798	$ (2,909)	(993,876)	$ 124,736
Balance (in shares) at Dec. 31, 2015	180,567,444			479,953		180,567,444
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company					(57,487)	$ (57,487)
Other comprehensive income			(551)			(551)
Stock based compensation	$ 1	9,289				9,290
Stock based compensation (in shares)	105,479
Stock dividend	$ 1	103			(104)
Stock dividend (in shares)	66,061
Public offering, common stock, net	$ 104	8,824				8,928
Public offering, common stock, net (in shares)	10,400,000
Stock option exercises	$ 4	98		$ (182)		(80)
Stock option exercises (in shares)	465,111			102,375
Exercise of warrants	$ 1	251				$ 252
Exercise of warrants (in shares)	119,879					119,879
Balance at Dec. 31, 2016	$ 1,917	$ 1,137,482	$ 247	$ (3,091)	$ (1,051,467)	$ 85,088
Balance (in shares) at Dec. 31, 2016	191,723,974			582,328		191,723,974