Subsequent Events (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended
	Feb. 28, 2013	Dec. 31, 2012	Feb. 28, 2013 ATM Program [Member]	Dec. 31, 2012 ATM Program [Member]	Feb. 28, 2013 Venture Capital Funds [Member]	Feb. 28, 2013 March 2013 [Member]	Feb. 28, 2013 March 2014 [Member]	Feb. 28, 2013 Subsequent Event [Member]	Dec. 31, 2012 Subsequent Event [Member]	Feb. 11, 2013 Subsequent Event [Member]
Subsequent Event [Line Items]
Loan payable	$ 10				$ 10	$ 6	$ 4
Maturity period of loan								42 months
Bear interest rate								10.45%
Number of payments of principal and interest until maturity									30 equal payments of principal and interest
Debt instrument term minimum proceeds from shareholders								12.5
Fully vested options										900,000
Number of common stock shares sold through public offering								6,100,000
Gross proceeds from issuance of common stock	7.9	8.8	14.4
Net proceeds from issuance of common stock								7.3
Number of common stock issued through company ATM program		4,700,000	6,600,000	1,863,830
Proceeds from sale of common stock, Net				$ 5.4					$ 8.5
Subsequent Events (Textual) [Abstract]
Price of public offering	$ 1.30
Time period of interest payment		First 12 Months
Warrants issued to purchase common stock	775,000