FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Liabilities that are measured at fair value on a recurring basis
Warrants	$ 190		$ 0
Change in the estimated fair value of warrant liabilities
Balance at December 31, 2015			0
Decrease in fair value	203	$ (461)	(99)	$ (256)
Balance at September 30, 2016	190		190
Warrants
Liabilities that are measured at fair value on a recurring basis
Warrants	658		757
Change in the estimated fair value of warrant liabilities
Balance at December 31, 2015			757
Decrease in fair value			(99)
Balance at September 30, 2016	658		658
Warrants | Recurring
Liabilities that are measured at fair value on a recurring basis
Warrants	658		757
Change in the estimated fair value of warrant liabilities
Balance at December 31, 2015			757
Balance at September 30, 2016	658		658
Warrants | Recurring | Level 2
Liabilities that are measured at fair value on a recurring basis
Warrants	658		757
Change in the estimated fair value of warrant liabilities
Balance at December 31, 2015			757
Balance at September 30, 2016	658		658
Warrants | Recurring | Level 3
Liabilities that are measured at fair value on a recurring basis
Warrants	0		0
Change in the estimated fair value of warrant liabilities
Balance at December 31, 2015			0
Balance at September 30, 2016	$ 0		$ 0