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Leases - Schedule of Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets and Liabilities, Lessee    
Operating lease assets $ 128 $ 786
Finance lease assets $ 90 $ 6,781
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization
Total lease assets $ 218 $ 7,567
Operating lease liabilities current 206 362
Finance lease liabilities current 16 0
Current portion of finance lease obligation - related parties 0 648
Operating lease liabilities non-current 314 490
Finance lease liabilities non-current 68 0
Present value of lease liabilities $ 604 $ 1,500