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Warrants (Tables)

9 Months Ended

Sep. 30, 2017

Warrants [Abstract]

Summary of outstanding and exercisable warrants issued to private placement

								Shares
				Number of				Underlying				Shares
				Shares				Warrants				Underlying
				Underlying				Exchanged,				Warrants
				Warrants				Exercised				Outstanding								Expiration
				Originally				or				and				Exercise				Term
Description		Grant Date		Granted				Expired				Exercisable				Price				in years
Series A⁽¹⁾		January 27, 2014			315,676				(315,676	)			-				N/A				N/A
Series B⁽¹⁾		January 27, 2014			157,846				-				157,846			$	45.00				1.33
Series C⁽²⁾		November 19, 2014			145,399				(142,957	)			2,442			$	12.00				2.63
									142,957				142,957			$	9.00				2.63
Series D⁽²⁾		November 19, 2014			193,865				(193,865	)			-				N/A				N/A
Series E⁽²⁾		November 19, 2014			145,399				(145,399	)			-				N/A				N/A
									142,957				142,957			$	9.00				4.63
Rens⁽³⁾		March 3, 2016			375,000				-				375,000			$	7.00				3.42
					1,333,185				(511,983	)			821,202

(1)	Issued in connection with the January 27, 2014 private placement transaction.
(2)	Issued in connection with the November 19, 2014 registered direct public offering, and subsequently revised pursuant to Warrant Exercise Agreements entered into on May 18, 2015.
(3)	Shares issued pursuant to the closing of the first tranche of the Financing with RENS Technology Inc.

Summary of warrants activities

		Shares Underlying Warrants				Average Exercise Price
Balance at December 31, 2016			1,136,878			$	15.01
Warrants expired			(315,676	)		$	15.00
Balance at September 30, 2017			821,202			$	15.02

Summary of assumptions used to value warrants using Black-Scholes option pricing model

				Number of
				Shares				Stock
		Grant /		Underlying				Price on
		Modification		Warrants				Measurement				Exercise				Expected				Expected				Dividend				Risk Free
Description		Date		Granted				Date				Price				Term				Volatility				Yield				Rate
Series B		1/27/2014			157,846			$	7.00			$	45.00				5.00				150.00	%			0.00	%			1.61	%
Series C		11/19/2014			145,399			$	9.37			$	12.00				5.50				94.60	%			0.00	%			1.64	%
Repricing Series C		5/18/2015			142,957			$	5.95			$	9.00				5.00				96.34	%			0.00	%			1.46	%
Repricing Series E		5/18/2015			142,957			$	5.95			$	9.00				7.00				96.34	%			0.00	%			1.87	%
Rens Technology		3/3/2016			375,000			$	7.00			$	7.00				4.00				96.34	%			0.00	%			1.87	%