Financial Instruments with Concentrations of Credit Risk (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Allowance for doubtful accounts receivable	$ 0.6	$ 0.3
Government Contracts Concentration Risk \| Revenue from Contract with Customer Benchmark \| U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	68.00%	76.00%	75.00%
Customer Concentration Risk \| Revenue from Contract with Customer Benchmark \| Four Utility Customers
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	17.00%	14.00%	14.00%
Customer Concentration Risk \| Accounts Receivable \| U.S. Government
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	28.00%	40.00%
Customer Concentration Risk \| Accounts Receivable \| Four Utility Customers
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk percentage	50.00%	19.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.