Summary of Significant Accounting Policies - Narrative (Details)	1 Months Ended				6 Months Ended
	Jul. 31, 2026 USD ($)	Jul. 31, 2025 USD ($)	Sep. 30, 2024 USD ($) generator	Jul. 31, 2024 USD ($)	Jun. 30, 2026 USD ($) segment	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Property, Plant, and Equipment [Line Items]
Total equity					$ 169,539,000	$ 181,724,000	$ 192,009,000	$ 215,870,000	$ 227,987,000	$ 244,389,000
Cash and cash equivalents					13,166,000		22,938,000	$ 15,591,000		$ 9,227,000
Total investments					$ 119,200,000
Number of operating segments | segment					1
Number of reportable segments | segment					1
Accounts receivable from customers					$ 2,500,000		500,000
Allowance for doubtful accounts					$ 0		$ 0
Maturity date (or less)					36 months
Best effort cost-plus-fixed-fee contract (up to)		$ 1,500,000	$ 16,000,000.0	$ 200,000
Number of generators | generator			7
Research and Development Service
Property, Plant, and Equipment [Line Items]
Government assistance, payment period					90 days
Subsequent Events
Property, Plant, and Equipment [Line Items]
Best effort cost-plus-fixed-fee contract (up to)	$ 41,700,000
Corporate Headquarters Lessor
Property, Plant, and Equipment [Line Items]
Letter of credit					$ 700,000