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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable - Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 261 | $ 351 | $ 303
Additions- Charges to (Recovery of) Costs and Expenses | 141 | 175 | 124
Deductions- Write- offs/Costs Incurred | 24 | 265 | 76
Balance at End of Year | 378 | 261 | 351
Deferred Tax Assets - Valuation Allowance [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 51,589 | 45,626 | 26,920
Additions- Charges to (Recovery of) Costs and Expenses | 13,471 | 8,279 | 21,042
Deductions- Write- offs/Costs Incurred | 405 | 2,316 | 2,336
Balance at End of Year | $ 64,655 | $ 51,589 | $ 45,626

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