Stock Based Compensation (Details Textual) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended
	Apr. 04, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 03, 2010
Stock-Based Compensation (Textual)
Share-based compensation expense		$ 1,729,000	$ 2,656,000	$ 3,499,000
Weighted average grant date fair value		$ 3.14
Options granted to purchase of common stock to employee		10,000		360,000
Options granted to purchase of common stock to board members		395,200	145,000	1,175,000
Stock based compensation options granted to purchase of common stock to employee fair value		1,300,000	748,000
Placement agent fee		600,000
Stock options vesting period description			The options have a 7-year life and 1/3 of the options are vested on the one year anniversary date of grant with the remaining to vest monthly over the remaining 24-months.
Common stock issuable upon exercise of warrants				235,144
Estimated fair value of the warrants	166,000
Number of Options Outstanding		1,709,400
Number of shares vested and expected to vest		54,060
Warrant [Member]
Stock-Based Compensation (Textual)
Share-based compensation expense		38,000	26,000	91,000
Vesting period					24 months	24 months
Common stock issuable upon exercise of warrants		10,053	1,384,719		20,000	120,000
Exercise price of warrants per share					$ 3.90	$ 1.63
Estimated fair value of the warrants					$ 75,000	$ 198,000
Number of Options Outstanding		3,355,073	828,573	4,704,636	5,405,606