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Fixed Assets - Supplemental balance sheet and cash flow information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating Lease    
Operating lease ROU assets, net $ 322 $ 453
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Lease Liabilities:    
Current lease liabilities $ 133 $ 205
Long term lease liabilities 226 350
Total lease liabilities $ 359 555
Weighted average remaining lease term (in years) 2 years 7 months 6 days  
Weighted average discount rate 5.50%  
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 251 218
New operating lease liabilities $ 25 320
Impairment of ROU assets   $ 63