DERIVATIVE INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2017

DERIVATIVE INSTRUMENTS

Assumptions used in determining fair value of warrants

	September 30,		December 31,
	2017		2016
Risk free interest rate	1.5	%	1.2	%
Expected dividend yield	—	%	—	%
Contractual term (in years)	1.6		2.4
Expected volatility	86	%	89	%

Changes in derivative warrant liability

	Three Months Ended September 30,
	2017		2016
Balance at June 30,	$	519	$	2,359
Increase in derivative liability prior to warrant exchange		3,029		—
Reduction in derivative liability due to warrant exchange		(3,537)		—
Increase (decrease) in the fair value of warrants		30		336
Balance at September 30,	$	41	$	2,695

	Nine Months Ended September 30,
	2017		2016
Balance at December 31,	$	1,314	$	1,907
Increase in derivative liability prior to warrant exchange		3,029		—
Reduction in derivative liability due to warrant exchange		(3,537)		—
Increase (decrease) in the fair value of warrants		(765)		788
Balance at September 30,	$	41	$	2,695