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Fixed Assets - Lease costs (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease cost:    
Operating lease cost $ 242,000 $ 238,000
Total lease cost $ 242,000 238,000
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases   $ 215,000
For operating lease:    
Weighted average remaining lease term (in years)   2 years 4 months 2 days
Weighted average discount rate   7.00%