Stock-Based Compensation (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of all stock option plans / warrant activity
Weighted Average Number of Shares/Warrants, Outstanding, Ending Balance	1,709,400
Employee Stock Option [Member]
Summary of all stock option plans / warrant activity
Weighted Average Number of Shares/Warrants, Outstanding, Beginning Balance	1,600,583	1,715,200	19,324
Weighted Average Number of Shares, Granted	405,200	145,000	1,704,000
Weighted Average Number of Shares, Cancelled or expired	296,383	(18,256)	(8,124)
Weighted Average Number of Shares, Exercised		(241,361)
Weighted Average Number of Shares/Warrants, Outstanding, Ending Balance	1,709,400	1,600,583	1,715,200
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 5.22	$ 5.04	$ 92.19
Weighted Average Exercise Price, Granted	$ 6.31	$ 6.06	$ 4.35
Weighted Average Exercise Price,Cancelled or expired	$ 5.46	$ 5.57	$ 69.36
Weighted Average Exercise Price, Exercised		$ 4.39
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 4.92	$ 5.22	$ 5.04
Employee Stock Option [Member] | Minimum [Member]
Summary of all stock option plans / warrant activity
Exercise price per share, Outstanding, Beginning Balance	4.02	4.02	35.39
Stock Option Plans, Exercise Price Per Share Granted	$ 2.08	$ 5.54	$ 4.02
Stock Option Plans, Exercise Price Per Share Cancelled or expired	$ 4.65	$ 4.25	$ 35.39
Stock Option Plans, Exercise Price Per Share Exercised		$ 4.25
Exercise price per share, Outstanding, Ending Balance	2.08	4.02	4.02
Employee Stock Option [Member] | Maximum [Member]
Summary of all stock option plans / warrant activity
Exercise price per share, Outstanding, Beginning Balance	125.00	125.00	368.75
Stock Option Plans, Exercise Price Per Share Granted	$ 8.21	$ 7.70	$ 6.28
Stock Option Plans, Exercise Price Per Share Cancelled or expired	$ 122.50	$ 125.00	$ 368.75
Stock Option Plans, Exercise Price Per Share Exercised		$ 6.28
Exercise price per share, Outstanding, Ending Balance	86.25	125.00	125.00