Share-Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares outstanding, Beginning Balance	2,068,720	562,025	544,340
Number of shares, Granted	348,000	1,532,000	38,000
Number of shares, Expired	(51,637)
Number of shares, Forfeited	(278,633)	(25,305)	(20,315)
Number of shares outstanding, Ending Balance	2,086,450	2,068,720	562,025	544,340
Number of shares, Exercisable	1,100,250
Weighted-average exercise price, Outstanding, Beginning of Period	$ 7.93	$ 18.56	$ 19.25
Weighted-average exercise price, Granted	$ 4.19	$ 4.15	$ 8.02
Weighted-average exercise price, Expired	$ 21.61
Weighted-average exercise price, Forfeited	$ 4.45	$ 14.71	$ 15.48
Weighted-average exercise price, Outstanding, End of Period	$ 7.43	$ 7.93	$ 18.56	$ 19.25
Weighted-average exercise price, Exercisable	$ 10.63
Weighted-average remaining contractual term (in years), Outstanding	7 years 2 months	8 years 5 months	7 years 0 months	7 years 6 months
Weighted-average remaining contractual term (in years), Exercisable	7 years 2 months
Aggregate intrinsic value, Outstanding, Beginning	$ 544	$ 0	$ 0
Aggregate intrinsic value, Outstanding, Ending	0	544	0	0
Aggregate intrinsic value, Exercisable	$ 0