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Financial Instruments with Concentrations of Credit Risk - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |  |
Allowance for doubtful accounts receivable | $ 0.2 | $ 0.2 |
Government Contracts Concentration Risk | Sales Revenue, Net | U.S. Government |  |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |  |
Concentration risk percentage | 76.00% | 76.00% | 77.00%
Customer Concentration Risk | Sales Revenue, Net | Utility Customers |  |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |  |
Concentration risk percentage | 14.00% | 14.00% | 13.00%
Customer Concentration Risk | Accounts Receivable | U.S. Government |  |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |  |
Concentration risk percentage | 68.00% | 68.00% |
Customer Concentration Risk | Accounts Receivable | Utility Customers |  |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |  |
Concentration risk percentage | 15.00% | 18.00% |

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