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LEASES (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lease cost      
Operating lease costs $ 118 $ 260  
Short-term lease costs 1,171 12,258  
Variable lease costs 113 210  
Total lease costs 1,402 12,728  
Other information      
Operating cash flows from operating leases $ 211 $ 254  
Weighted-average remaining lease term - operating leases 4 months 24 days 3 years 3 months 18 days  
Weighted-average discount rate - operating leases 3.70% 3.70%  
Maximum      
LEASES      
Initial lease term 5 years   5 years