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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforwards, Expire year | 2028 |  |
Unrecognized tax benefits | $ 412,000 | $ 428,000 | $ 428,000
Cumulative loss period | 3 years |  |
Valuation allowance | $ 57,346,000 | 49,405,000 |
Increase (decrease) in valuation allowance of deferred tax assets | (7,900,000) | (1,000,000.0) |
Interest and penalties | 0 | 0 |
Cumulative interest and penalties | 0 | 0 |
Outstanding tax audit | 0 |  |
Income before provision for income taxes for foreign subsidiaries | 473,000 | 112,000 |
Income related to GILTI | $ 300,000 |  |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards |  | 180,300,000 |
Net operating loss carryforwards, expiry terms | Federal NOL carryforwards will expire from 2024 through 2037 |  |
Tax credit carryforwards | $ 2,500,000 |  |
State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards |  | $ 148,600,000 |
Net operating loss carryforwards, expiry terms | State NOL carryforwards will expire 2018 through 2041 |  |
Tax credit carryforwards | $ 700,000 |  |
Federal income tax returns subject to examination description | The Company is no longer subject to examination for U.S. federal income tax returns for years before December 31, 2018 and for state income tax returns, the Company is no longer subject to examination for years before December 31, 2017 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.3) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 + Details
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