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8. COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future minimum contractual lease obligations

At December 31, 2018, future minimum contractual lease obligations were as follows:

 

Years ending December 31,:     Operating Leases  
2019       1,372  
2020       1,357  
2021       1,350  
2022       1,350  
2023       571  
Thereafter        
Total minimum lease payments     $ 6,000