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BUSINESS COMBINATION - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 06, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenues   $ 54,357 $ 47,268 $ 107,244 $ 93,751  
Net loss   6,585 $ 2,777 7,034 $ 5,027  
WellSpring Pharma Services Inc [Member]            
Business Combination, Consideration Transferred $ 16,700          
Revenues   2,200   4,200    
Net loss   $ (100)   $ (1,400)    
Business Combination, Acquisition Related Costs           $ 1,100
Business Combination Purchase Price Before Adjustments $ 18,000