Supplemental Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015
Operating expenses:
Research and development	$ 1,097,000	$ 806,000	$ 1,656,000	$ 373,000	$ 956,000	$ 445,000	$ 558,000	$ 474,000	$ 3,931,600	$ 2,432,700
General and administrative	7,404,000	1,336,000	3,731,000	1,448,000	2,320,000	671,000	556,000	797,000	13,918,600	4,344,400
Total operating expenses	8,501,000	2,142,000	5,387,000	1,821,000	3,276,000	1,116,000	1,114,000	1,271,000	17,850,200	6,777,100
Loss from operations	(8,501,000)	(2,142,000)	(5,387,000)	(1,821,000)	(3,276,000)	(1,116,000)	(1,114,000)	(1,271,000)	(17,850,200)	(6,777,100)
Other expenses, net:
Interest expense, net	(1,000)	(3,000)	(12,000)	(755,000)	(2,366,000)	(792,000)	(606,000)	(785,000)	(770,800)	(4,548,700)
Change in warrant liability				(1,895,000)	(563,000)	953,000	1,302,000	(1,727,000)	(1,894,700)	(34,600)
Loss on extinguishment of debt			(1,649,000)	(25,051,000)					(26,700,200)	(2,388,000)
Other expense		(2,000)							(2,300)	(135,000)
Loss before income taxes	(8,502,000)	(2,147,000)	(7,048,000)	(29,522,000)	(6,222,000)	(1,090,000)	(2,021,000)	(4,551,000)	(47,218,200)	(13,883,400)
Income taxes				(2,000)				(2,000)	(2,300)	(2,400)
Net loss	(8,502,000)	(2,147,000)	(7,048,000)	(29,524,000)	$ (6,222,000)	$ (1,090,000)	$ (2,021,000)	$ (4,553,000)	(47,220,500)	$ (13,885,800)
Accrued dividends on Series B Preferred stock	(681,000)	(631,000)	(615,000)	(213,000)					(2,140,500)
Deemed dividend on Series B Preferred Units	(246,000)	(669,000)	(887,000)	(256,000)					(2,058,000)
Net loss attributable to common stockholders	$ (9,429,000)	$ (3,447,000)	$ (8,550,000)	$ (29,993,000)					$ (51,419,000)	$ (13,885,800)
Basic and diluted net loss per common share (in dollars per share)	$ (4.44)	$ (1.95)	$ (5.26)	$ (19.23)					$ (29.08)
Basic net loss per common share (in dollars per share)					$ (4.24)	$ (0.84)	$ (1.58)	$ (3.70)	(29.08)	$ (10.53)
Diluted net loss per common share (in dollars per share)					$ (4.24)	$ (1.08)	$ (1.90)	$ (3.70)	$ (29.08)	$ (10.61)
Weighted average shares used in computing:
Basic and diluted net loss per common share (in shares)	2,123,936	1,765,641	1,624,371	1,559,483					1,767,957
Basic net loss per common share (in shares)					1,466,402	1,302,316	1,279,267	1,229,504	1,767,957	1,318,813
Diluted net loss per common share (in shares)					1,466,402	1,302,316	1,299,115	1,229,504	1,767,957	1,318,813