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Business Combination - Schedule of Outstanding Shares of Common Stock (Details) - shares shares in Thousands | Dec. 31, 2021 | Dec. 15, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Business Acquisition [Line Items] |  |  |  |
MoSys common stock outstanding prior to business combination | 21,579 | 8,715,910 | 5,241 |
Common stock issued to Peraso Tech stockholders | 21,579 |  | 5,241 |
Total shares issued and outstanding |  | 21,569,158 |  |
Common Stock |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock issued to Peraso Tech stockholders | 21,579 |  | 5,241 | 164
Escrow Shares - common stock |  | 502,567 |  |
Exchangeable Shares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Escrow Shares - common stock |  | 1,312,878 |  |
Peraso Tech |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock issued to Peraso Tech stockholders |  | 3,055,584 |  |
Exchangeable Shares issued to Peraso Tech stockholders |  | 7,982,219 |  |

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