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COMMITMENTS AND CONTINGENCIES - Lease Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lease Cost      
Amortization of right-of-use assets $ 21    
Interest on lease obligation 2    
Total finance lease cost 23    
Total operating lease cost 585    
Short-term lease cost 1,231    
Total lease cost 1,839    
Cash paid for amounts included in the measurement of lease obligation:      
Operating cash flows from operating leases 582    
Financing cash flows from finance leases 20
Right-of-use assets obtained in exchange for new finance lease obligations    
Right-of-use assets obtained in exchange for new operating lease obligations $ 265    
Weighted average remaining lease term for operating leases 5 years 7 months 6 days    
Weighted average remaining lease term for finance leases 2 years 8 months 12 days    
Weighted average discount rate for operating leases 3.40%    
Weighted average discount rate for finance leases 4.00%    
Boniface Engineering Ltd.      
Lease Cost      
Total lease cost $ 223 219 202
Jige International S.a.      
Lease Cost      
Total lease cost $ 109 $ 116 $ 102