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NET LOSS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
NET LOSS PER SHARE
Net loss	$ (5,711)	$ (14,928)	$ (7,420)	$ (24,080)
Weighted average common shares outstanding:
Basic	22,897,686	22,766,894	22,888,746	22,754,772
Diluted	22,897,686	22,766,894	22,888,746	22,754,772
Basic loss per share of common stock	$ (0.25)	$ (0.66)	$ (0.32)	$ (1.06)
Diluted loss per share of common stock	$ (0.25)	$ (0.66)	$ (0.32)	$ (1.06)

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Weighted Average Number Of Shares Outstanding Basic And Diluted [Abstract]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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