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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Revenue $ 2,100   $ 1,900    
Diluted net loss per share (in usd per share) $ 0.01 $ (0.01) $ 0.01   $ (0.01)
Professional Engineering Services Contracts          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Revenue $ 1,264 $ (1,145) $ 1,003 $ (1,500)  
Basic net loss per share (in usd per share) $ 0.01 $ (0.01) $ 0.01 $ (0.01)