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Other Financial Information - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Depreciation and amortization $ 300 $ 100 $ 700 $ 400  
Property and equipment, gross 7,043   7,043   $ 5,043
Assets under capital lease          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 2,500   $ 2,500   $ 1,200