CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2011	$ 117,859	$ 140	$ 370,123	$ (252,404)
Balance (in shares) at Dec. 31, 2011		13,977,920
Increase (Decrease) in Stockholders' Equity
Stock issued for restricted stock (in shares)		38,667
Stock issued under defined contribution 401(k) retirement savings plan	523		523
Stock issued under defined contribution 401(k) retirement savings plan (in shares)		181,205
Reclass between APIC and CS due to 10-1 Split		(126)	126
Share-based compensation	2,833		2,833
Net loss	(17,907)			(17,907)
Balance at Dec. 31, 2012	103,308	14	373,605	(270,311)
Balance (in shares) at Dec. 31, 2012	14,197,792	14,197,792
Increase (Decrease) in Stockholders' Equity
Stock issued for restricted stock	1	1
Stock issued for restricted stock (in shares)		222,011
Stock issued under defined contribution 401(k) retirement savings plan	(499)		499
Stock issued under defined contribution 401(k) retirement savings plan (in shares)		143,425
Share-based compensation	1,438		1,438
Net loss	(7,703)			(7,703)
Balance at Sep. 30, 2013	$ 97,543	$ 15	$ 375,542	$ (278,014)
Balance (in shares) at Sep. 30, 2013	14,563,228	14,563,228