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LEASES (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
LEASES      
Initial lease term 2 years 3 months 18 days   5 years
Lease cost      
Operating lease costs $ 346 $ 1,869  
Short-term lease costs 2,231 16,372  
Variable lease costs 307 798  
Total lease costs 2,884 19,039  
Other information      
Operating cash flows from operating leases 439 $ 2,093  
Right-of-use assets obtained in exchange for new operating lease liabilities $ 841    
Weighted-average remaining lease term - operating leases 2 years 2 months 12 days 8 months 12 days  
Weighted-average discount rate - operating leases 4.29% 3.70%