CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2013	$ 86,906,000	$ 929,000	$ 253,193,000	$ (166,609,000)	$ (607,000)
Balance (in shares) at Dec. 31, 2013		92,906,049
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	63,269,000	$ 0	0	63,269,000	0
Foreign currency translation adjustment	607,000	0	0	0	607,000
Stock-based compensation	2,703,000	0	2,703,000	0	0
Stock options exercised	255,000	$ 3,000	252,000	0	0
Stock options exercised (in shares)		238,157
Restricted stock issued, net of cancellations	0	$ 15,000	(15,000)	0	0
Restricted stock issued, net of cancellations (in shares)		1,542,472
Balance at Dec. 31, 2014	207,495,000	$ 1,062,000	309,773,000	(103,340,000)	0
Balance (in shares) at Dec. 31, 2014		106,186,678
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(127,110,000)	$ 0	0		0
Stock issuance	53,755,000	$ 115,000	53,640,000
Stock issuance (in shares)		11,500,000
Stock-based compensation	3,912,000	$ 0	3,912,000	0	0
Stock options exercised	168,000	$ 1,000	167,000	0	0
Stock options exercised (in shares)		164,400
Restricted stock issued, net of cancellations	0	$ 0	0	0	0
Restricted stock issued, net of cancellations (in shares)		(5,077)
Balance at Dec. 31, 2015	$ 84,465,000	$ 1,063,000	313,852,000	(230,450,000)	0
Balance (in shares) at Dec. 31, 2015	106,346,001	106,346,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (96,378,000)	$ 0	0		0
Stock-based compensation	3,194,000	0	3,194,000	0	0
Stock options exercised	49,000	$ 1,000	48,000	0	0
Stock options exercised (in shares)		55,716
Restricted stock issued, net of cancellations	0	$ 0	0	0	0
Restricted stock issued, net of cancellations (in shares)		(98,802)
Balance at Dec. 31, 2016	$ 18,505,000	$ 1,351,000	$ 343,982,000	$ (326,828,000)	$ 0
Balance (in shares) at Dec. 31, 2016	106,186,678	135,094,017