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 ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Professional Engineering Services Contracts        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Revenue $ (785) $ 1,002 $ 218 $ (498)
Basic net loss per share (in usd per share) $ (0.04) $ 0.06 $ 0.01 $ (0.03)
Diluted net loss per share (in usd per share) $ (0.04) $ 0.06 $ 0.01 $ (0.03)
Individual Professional Services Contract        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Revenue   $ 1,000 $ 1,200 $ 1,100