Summary of Common Stock Warrants - E, F, G, H (Details)	12 Months Ended
Summary of Common Stock Warrants - E, F, G, H (Details)	Dec. 31, 2015 shares
Series E $1.00 exercise price
Outstanding E, F, G and H Warrants	107,931
Warrants Issued	0
Warrants Exercised	(107,931)
Warrants Issued	0
Warrants Exercised	0
Shares issued in 2014 as a result of cashless exercise	73,388
Series F $3.00 exercise price
Outstanding E, F, G and H Warrants	369,037
Warrants Exercised	(369,037)
Shares issued in 2014 as a result of cashless exercise	210,870
Series G $0.65 exercise price
Outstanding E, F, G and H Warrants	88,579
Warrants Exercised	(88,579)
Shares issued in 2014 as a result of cashless exercise	70,152
Series H $7.00 exercise price
Outstanding E, F, G and H Warrants	689,159
Outstanding E, F, G and H Warrants	689,159
Outstanding E, F, G and H Warrants	689,159
E,F,G,H Total Warrants
Outstanding E, F, G and H Warrants Total	1,254,706
Warrants Exercised Total	(565,547)
Outstanding E, F, G and H Warrants Total	689,159
Outstanding E, F, G and H Warrants Total	689,159
Shares issued in 2014 as a result of cashless exercise Total	354,410