Warrants (Tables)

6 Months Ended

Jun. 30, 2017

Warrants and Rights Note Disclosure [Abstract]

Schedule of Warrant Activity

The following table summarizes our warrant activities for the six months ended June 30, 2017:

			Weighted
	Common		Average
	Stock		Exercise
	Warrants		Price
Outstanding as of January 1, 2016		1,278,566	$	8.45
Issued		5,055,345		0.90
Expired		(42,580)		31.73
Outstanding at January 1, 2017		6,291,331	$	2.23
Issued		-		-
Expired		-		-
Outstanding at June 30, 2017		6,291,331	$	2.23

Schedule of Warrant Valuation Assumptions

The estimated fair value was derived using a valuation model with the following weighted-average assumptions:

	Quarter Ended
	June 30,
	2017			2016
Value of underlying common stock (per share)	$	0.66		$	1.91
Risk free interest rate		1.85	%		0.80	%
Expected term		5.1	years		3.5	years
Volatility		96	%		68	%
Dividend yield		0	%		0	%

Schedule of Warrants Activities Used In Derivative Liability

The following table summarizes our activities related to warrants accounted for as a derivative liability for the six months ended June 30, 2017 and 2016:

	2017		2016
Balance at January 1,		1,125,119		1,125,119
Derivative warrants issued, exercised and expired		-		-
Balance at June 30,		1,125,119		1,125,119