Equity (Details 2) (Warrant [Member], USD $)	6 Months Ended	0 Months Ended
	Jun. 30, 2014	Sep. 19, 2012 Private Placement [Member]
Number of Underlying Shares
Outstanding at the beginning of period (in shares)	5,263,578
Expired during period	(1,831,929)
Outstanding at the end of period (in shares)	3,431,649
Weighted Average Exercise Price Per Share
Outstanding at the beginning of period (in dollars per share)	12.10
Expired during period	19.00
Outstanding at the end of period (in dollars per share)	8.42	8.42
Number of common shares that can be purchased upon exercise of warrant		6,863,298
Sale price (in dollars per shares)		$ 5.75
Number of shares of common stock per capital unit (in shares)		1
Number of common shares which can be purchased with each warrant		0.50