Principal Business Activities and Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended					9 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010	Feb. 28, 2013	Dec. 31, 2009	Feb. 28, 2013 ATM Program [Member]	Dec. 31, 2012 ATM Program [Member]	Jun. 15, 2012 ATM Program [Member]	Dec. 31, 2012 Patents [Member]
Organization and Summary of Significant Accounting Policies [Line Items]
Proceeds from issue of common stock through ATM program								$ 20,000,000
Number of common stock issued through company ATM program	4,700,000					6,600,000	1,863,830
Proceeds from sale of common stock, Gross							5,600,000
Proceeds from sale of common stock, Net							5,400,000
Remaining Available common stock under the ATM Program							14,400,000
Useful life of patents									15 years
Principal Business Activities and Summary of Significant Accounting Policies (Textual) [Abstract]
Cash and cash equivalents	7,861,524	27,996,871	30,520,812		29,673,420
Amount raised by company in net proceeds	15,800,000
Net proceeds from private placements/public offering	7,300,000
Amount to be borrowed				10,000,000
Available amount up to company up on closing				6,000,000
Associated revenue over the related service period	generally expected to be two years
Liquid investment maturity period	three months or less
Number of segments operated by the company	1
Comprehensive loss	(22,672,532)	(20,384,715)	(19,922,515)
Options granted to employees vested over defined service	generally four years
Proceeds from common stock , net	$ 8,500,000