Basis of Presentation and Summary of Significant Accounting Policies - Professional Engineering Contracts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Professional Engineering Services Contracts
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Revenue	$ (1,145)	$ (1,360)	$ (1,500)	$ (2,163)