ACQUISITION - Summary of Unaudited Proforma Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Combinations [Abstract]
Revenues	$ 82,172	$ 81,728
Net loss	$ (15,667)	$ (17,739)
Net Income per share (in dollars per share)	$ (780)	$ (890)
Basic and diluted (in shares)	20,052	19,877