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PROPERTY AND EQUIPMENT - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
ft²
Mar. 31, 2018
USD ($)
Property Plant And Equipment [Line Items]    
Depreciation expense $ 2,758 $ 2,172
Ewing, New Jersey Properties [Member]    
Property Plant And Equipment [Line Items]    
Area of facility acquired | ft² 88,000  
Cost of facilty acquired $ 8,200