Summary of Common Stock Warrants - E, F, G, H (Details)	Series E $ 1.00 exercise price	Series F $ 3.00 exercise price	Series G $ 0.65 exercise price	Series H $ 7.00 exercise price	E,F,G,H Total Warrants
Outstanding. at Dec. 31, 2013	107,931	369,037	88,579	689,159	1,254,706
Issued	0	0	0	0	0
Exercised	(107,931)	(369,037)	(88,579)	0	(565,547)
Outstanding at Dec. 31, 2014	0	0	0	689,159	689,159
Issued	0	0	0	0	0
Exercised	0	0	0	0	0
Shares issued in 2014 as a result of cashless exercise at Mar. 31, 2015	73,388	210,870	70,152	0	354,410
Outstanding. at Mar. 31, 2015	0	0	0	689,159	689,159