Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, Non-vested - Beginning Balance	756,043	1,561,869	524,403
Stock Options, Granted	2,382,500	222,500	2,075,000
Stock Options, Vested/Exercised	(1,050,633)	(883,882)	(891,332)
Stock Options, Forfeited/Cancelled		(144,444)	(146,202)
Stock Options, Non-vested - Ending Balance	2,087,910	756,043	1,561,869
Weighted Average Grant Date Fair Value, Non-vested - Beginning Balance	$ 2.17	$ 2.11	$ 0.82
Weighted Average Grant Date Fair Value, Granted	$ 2.36	$ 1.69	$ 2.21
Weighted Average Grant Date Fair Value, Vested/Exercised	$ 2.35	$ 1.93	$ 0.81
Weighted Average Grant Date Fair Value, Forfeited/Cancelled		$ 2.27	$ 1.79
Weighted Average Grant Date Fair Value, Non-vested - Ending Balance	$ 2.30	$ 2.17	$ 2.11
Stock Options, Weighted average remaining period for vesting	2 years 1 month 24 days