Warrants (Tables)

6 Months Ended

Jun. 30, 2016

Warrants Tables

Warrant activity

	Warrants accounted for as:								Warrants accounted for as:
	Equity								Liabilities
	January 2012 warrants			March 2013 warrants			April 2013 warrants		February 2012 warrants			October 2013 Series A warrants		January 2014 warrants		Total
Outstanding, December 31, 2015		650			455			1,500		1,000			775		4,000		8,380
Warrants Expired		(650	)		(455	)		—		(889	)		—		—		(1,994	)
Warrants exercised		—			—			—		(111	)		—		—		(111	)
Outstanding, June 30, 2016		—			—			1,500		—			775		4,000		6,275
Expiration date		January 11, 2016			March 1, 2016			April 25, 2018		February 28, 2016			October 24, 2023		January 16, 2024

Fair value model of each option award

	October 2013 warrants			January 2014 warrants
Strike price	$	0.50		$	0.50
Expected term (years)		7.3			7.5
Cumulative volatility %		94	%		98	%
Risk-free rate %		1.31	%		1.33	%