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Income Taxes - Summary of Supplemental Balance Sheet Information Related to Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets | $ 59,189 | $ 55,687
Valuation Allowance | (50,232) | (45,818)
Deferred Tax Assets, net | 8,957 | 9,869
Domestic [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets | 47,839 | 43,791
Valuation Allowance | (47,839) | (43,791)
International [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets | 11,350 | 11,896
Valuation Allowance | (2,393) | (2,027)
Deferred Tax Assets, net | $ 8,957 | $ 9,869

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + 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 (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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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=84230637&loc=d3e32537-109319 + Details
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