DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2018

DERIVATIVE INSTRUMENTS

Assumptions used in determining fair value of warrants

	March 31,		December 31,
	2018		2017
Risk free interest rate	2.09	%	1.91	%
Expected dividend yield	—	%	—	%
Contractual term (in years)	1.1		1.4
Expected volatility	109	%	82	%

Changes in derivative warrant liability

	Three Months Ended March 31,
	2018		2017
Balance at December 31,	$	4	$	1,314
Increase in derivative liability prior to warrant exchange		—		—
Repurchase of warrants		(14)		—
Increase (decrease) in the fair value of warrants		12		(241)
Balance at March 31,	$	2	$	1,073