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CONVERTIBLE PREFERRED STOCK AND WARRANTS (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Reconciliation of changes in fair value
The following represents a reconciliation of the changes in fair value of warrants measured at fair value using Level 3 inputs during the year ended December 31, 2017: 
(in thousands)
2013
Placement Agent Warrants
Balance, December 31, 2015
$
267

Exercise of warrants
(698
)
Change in fair value
634

Balance, December 31, 2016
203

Exercise of warrants
(130
)
Change in fair value
(53
)
Balance, December 31, 2017
$
20