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NET LOSS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
NET LOSS PER SHARE
Net loss	$ (11,246)	$ (137)	$ (5,711)	$ (1,709)	$ (11,383)	$ (7,420)
Weighted average common shares outstanding:
Basic	23,176,934		22,897,686		23,117,571	22,888,746
Diluted	23,176,934		22,897,686		23,117,571	22,888,746
Basic loss per share of common stock	$ (0.49)		$ (0.25)		$ (0.49)	$ (0.32)
Diluted loss per share of common stock	$ (0.49)		$ (0.25)		$ (0.49)	$ (0.32)

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