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Stock-Based Compensation - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) shares | Dec. 31, 2021 USD ($) Quarters shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Options, Granted |  | 1,662,897 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award equity instruments granted |  | 133,384 |  |
Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ |  | $ 914,000 |  |
Cost Expected to be Expensed, Weighted Average Period |  | 3 years 9 months 18 days |  |
Restricted Stock Units (RSUs) [Member] | Related Parties [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award equity instruments granted |  | 7,398 | 0 | 0
Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Number | 814,272 |  |  |
Unrecognized Compensation Costs | $ |  | $ 13,853,000 |  |
Cost Expected to be Expensed, Weighted Average Period |  | 2 years 8 months 12 days |  |
Share-based Payment Arrangement, Option [Member] | Merger and Acquisition Transaction [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized Compensation Costs | $ |  | $ 7,281,000 |  |
Cost Expected to be Expensed, Weighted Average Period |  | 2 years 3 months 18 days |  |
Number Of Outstanding Options Unvested |  | 2,300,980 |  |
Share-based Payment Arrangement, Option [Member] | Related Parties [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Options, Granted |  | 321,777 | 3,347,705 | 1,003,185
Share-based Payment Arrangement, Option [Member] | General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Accelerated Cost | $ | $ 3,396,000 |  |  |
Valens Semiconductor Ltd. 2021 Share Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based Payment Award, Expiration Period |  | 10 years |  |
Sharebased Payment Award, Vesting Rights Percentage |  | 25.00% |  |
Share based Payment Award, Vesting Rights Remaining Spread In Quarters | Quarters |  | 12 |  |
Common stock capital shares reserved for future issuance additions |  | 8,370,000 | 2,318,860 |
Ordinary Shares, Reserved For Issuance |  | 28,383,788 | 20,013,788 |

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