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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.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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).

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