Warrant Liability (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2016

Dec. 31, 2015

Warrant Liability [Abstract]

Summary of assumptions used in connection with the valuation of warrants issued

	September 30, 2016			December 31, 2015
Number of shares underlying the warrants		303,694			303,694
Exercise price	$	5.10		$	5.10
Volatility		90	%		98	%
Risk-free interest rate		0.68	%		1.19	%
Expected dividend yield		0			0
Expected warrant life (years)		1.73			2.48
Stock Price	$	7.70		$	11.30

	Initial Measurement June 25, 2013			December 31,  2013			December 31, 2014			Exercised During 2015		December 31,  2015
Number of shares underlying the warrants		541,685			530,944			472,336			168,643		303,693
Exercise price	$	16.50		$	16.50		$	6.10		$	6.10	$	5.10
Volatility		140	%		135	%		128	%		117-119%		98	%
Risk-free interest rate		1.49	%		1.75	%		1.38	%		.81-1.06%		1.19	%
Expected dividend yield		0			0			0			0		0
Expected warrant life (years)		5.0			4.5			3.5			3.01-3.33		2.48
Stock price	$	9.60		$	18.00		$	9.80			$ 16.90-$22.20	$	11.30

Summary of fair value measurements using significant unobservable inputs (Level 3)

	December 31, 2015		Decrease from Warrants Exercised in 2016	Decrease in Fair Value		September 30, 2016
Warrant liability	$	2,434,101	—	$	1,109,192	$	1,324,909

	December 31, 2014		Decrease from Warrants Exercised in 2015			Increase in Fair Value		December 31, 2015
Warrant liability	$	3,789,562	$	(2,557,331	)	$	1,201,870	$	2,434,101