Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Leased property and equipment (Details)

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Commitments and Contingencies - Leased property and equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Capital Leased Assets [Line Items]      
Gross $ 433 $ 2,213  
Less: accumulated amortization 186 801  
Total 247 1,412  
Depreciation expense 256 321 $ 302
Leased Vehicles      
Capital Leased Assets [Line Items]      
Gross $ 433 481  
Leased Machinery and equipment      
Capital Leased Assets [Line Items]      
Gross   $ 1,732