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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment      
Depreciation $ 702 $ 628 $ 1,208
Equipment and furniture      
Property, Plant and Equipment      
Useful lives 5 years    
Computers and software | Minimum      
Property, Plant and Equipment      
Useful lives 2 years    
Computers and software | Maximum      
Property, Plant and Equipment      
Useful lives 3 years    
Automobiles      
Property, Plant and Equipment      
Useful lives 5 years