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LEASES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Lessee, Lease, Description [Line Items]      
Rent expense, inclusive of short-term and variable lease expense $ 800 $ 1,200  
Cash paid for operating lease liabilities 700 900  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
2021 348    
2022 60    
Total lease payments 408    
Less: imputed interest (18)    
Total operating lease liability future lease payments 390 1,035  
Current portion of operating lease liabilities included within other current liabilities 333 645  
Non-current portion of operating lease liabilities $ 57 $ 390 $ 41
Current portion of operating lease liabilities included within other current liabilities Current portion of operating lease liabilities included within other current liabilities    
Lease, Cost [Abstract]      
Weighted average remaining operating lease term (in years) 9 months 18 days 2 years 1 month 6 days  
Weighted average discount rate 11.30% 11.00%  
Minimum      
Lessee, Lease, Description [Line Items]      
Leases terms 1 year    
Leases renewal terms 3 years    
Maximum      
Lessee, Lease, Description [Line Items]      
Leases terms 5 years    
Leases renewal terms 5 years