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Fixed Assets - Lease costs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lease cost:    
Operating lease cost $ 238,000 $ 218,000
Total lease cost $ 238,000 218,000
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases   238,000
Right-of-use assets obtained in exchange for new operating lease liabilities   $ 505,000
For operating lease:    
Weighted average remaining lease term (in years)   3 years 1 month 13 days
Weighted average discount rate   7.17%