FAIR VALUE MEASUREMENTS - Schedule of reconciliation of opening and closing balances for fair value measurements categorized within Level 3 (Details) - Contingent Consideration Liabilities [Member] - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Convertible Note Derivative Liability
Beginning balance	$ 8,089	$ 7,836	$ 7,689
Payments	(179)		(100)
Valuation adjustment	(426)	253	247
Ending balance	$ 7,484	$ 8,089	$ 7,836