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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
ft²
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
ft²
Oct. 31, 2016
USD ($)
ft²
Loss Contingencies [Line Items]          
Area of real estate property | ft²       29,622  
Security deposit       $ 307  
operating leases, landlord reimbursement for lease improvements     $ 889    
operating leases, landlord reimb for lease improvements, additional payments $ 444        
Future minimum payments due 7,089   7,089    
Loss on contract termination   $ 2,641      
Contract termination fees payable $ 1,194   $ 1,194    
CJ CheilJedang Corporation          
Loss Contingencies [Line Items]          
Area of real estate property | ft²         9,874
Security deposit         $ 103
Six Hundred Fifty Suffolk Street, Lowell, Massachusetts          
Loss Contingencies [Line Items]          
Area of real estate property | ft² 13,702   13,702    
Operating leases, renewal term     5 years    
Subsidiaries          
Loss Contingencies [Line Items]          
Area of real estate property | ft² 4,100   4,100