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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Line Items] |  |  |
Applicable statutory tax rate | 23.00% | 23.00% | 23.00%
Deferrred tax asset valuation allowance | $ (31,892) | $ (22,297) |
Change in valuation allowance | $ (9,595) | (4,500) | $ (7,931)
Israel Tax Authority [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable statutory tax rate | 23.00% |  |
Operating Loss Carryforwards | $ 88,000 | $ 85,000 | $ 65,000
Internal Revenue Service (IRS) [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable statutory tax rate | 21.00% |  |
California Franchise Tax Board [Member] | Valens Semiconductor Inc [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable state tax rate | 8.84% |  |
California Franchise Tax Board [Member] | Valens Merger Sub, Inc [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable state tax rate | 8.84% |  |
Operating Loss Carryforwards | $ 5,000 |  |
Operating Loss Carryforwards, Limitations on Use | carry forward loss is subject to the 382 limitation and has no expiration date |  |
Texas State Tax Authority [Member] | Valens Semiconductor Inc [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable state tax rate | 0.75% |  |
National Tax Agency, Japan [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable statutory tax rate | 36.00% |  |
Federal Ministry of Finance, Germany [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable statutory tax rate | 30.00% |  |
State Administration of Taxation, China [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Applicable statutory tax rate | 5.00% |  |

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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 Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: 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.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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