FAIR VALUE OF ASSETS AND LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2016

FAIR VALUE OF ASSETS AND LIABILITIES

Summary of assets and liabilities measured at fair value on a recurring basis

	At December 31, 2016
	Level 1		Level 2		Level 3		Fair Value
Cash equivalents	$	21,353	$	—	$	—	$	21,353
Marketable securities		—		11,577		—		11,577
Derivative warrant liability	$	—	$	1,314	$	—	$	1,314

	At December 31, 2015
	Level 1		Level 2		Level 3		Fair Value
Cash equivalents	$	14,804	$	—	$	—	$	14,804
Marketable securities		—		5,274		—		5,274
Derivative warrant liability	$	—	$	1,907	$	—	$	1,907