Warrants Outstanding and Exercisable (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Warrant, exercise price	$ 3.07	$ 7.28	$ 14.96
Warrants, Outstanding as of end of period	8,091,000	5,131,000	2,287,000
Warrants, Exercisable at end of period	8,091,000
Warrants exercisable, weighted average exercise price	$ 3.07
2.13
Warrant, exercise price	$ 2.13
Warrants, Outstanding as of end of period	1,000,000
Warrants outstanding, weighted average remaining contractual life, years	1.39
Warrants outstanding, weighted average exercise price	$ 2.13
Warrants, Exercisable at end of period	1,000,000
Warrants exercisable, weighted average exercise price	$ 2.13
2.29
Warrant, exercise price	$ 2.29
Warrants, Outstanding as of end of period	2,100,000
Warrants outstanding, weighted average remaining contractual life, years	3.47
Warrants outstanding, weighted average exercise price	$ 2.29
Warrants, Exercisable at end of period	0
Warrants exercisable, weighted average exercise price	$ 0
2.44
Warrant, exercise price	$ 2.44
Warrants, Outstanding as of end of period	1,855,000
Warrants outstanding, weighted average remaining contractual life, years	4.72
Warrants outstanding, weighted average exercise price	$ 2.44
Warrants, Exercisable at end of period	1,855,000
Warrants exercisable, weighted average exercise price	$ 2.44
2.89
Warrant, exercise price	$ 2.89
Warrants, Outstanding as of end of period	1,858,000
Warrants outstanding, weighted average remaining contractual life, years	4.38
Warrants outstanding, weighted average exercise price	$ 2.89
Warrants, Exercisable at end of period	1,858,000
Warrants exercisable, weighted average exercise price	$ 2.89
6.24
Warrant, exercise price	$ 6.24
Warrants, Outstanding as of end of period	1,278,000
Warrants outstanding, weighted average remaining contractual life, years	2.88
Warrants outstanding, weighted average exercise price	$ 6.24
Warrants, Exercisable at end of period	1,278,000
Warrants exercisable, weighted average exercise price	$ 6.24