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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts Receivable - Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 378 | $ 261 | $ 351
Additions- Charges to (Recovery of) Costs and Expenses | 96 | 141 | 175
Deductions- Write- offs/Costs Incurred |  | 24 | 265
Balance at End of Year | 474 | 378 | 261
Deferred Tax Assets - Valuation Allowance [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 64,655 | 51,589 | 45,626
Additions- Charges to (Recovery of) Costs and Expenses | (17,687) | 13,471 | 8,279
Deductions- Write- offs/Costs Incurred |  | 405 | 2,316
Balance at End of Year | $ 46,968 | $ 64,655 | $ 51,589

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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