Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Professional Engineering Contracts (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Professional Engineering Contracts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Professional Engineering Services Contracts        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Revenue $ 1,002 $ (273) $ (498) $ (1,979)
New Individual Professional Services Contract        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Revenue $ 1,000   $ 1,100