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Stockholders' Equity - Additional information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common Stock repurchased as per November plan |  |  |  |  | $ 30,000,000
Stock repurchase program amount available |  | $ 8,541,000 |  |  |
Stock repurchase |  | 0 | 0 | 0 |
Underwritten Public Offer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock shares issued during the period | 1,769,231 |  |  |  |
Sale of common stock share net amount of inflows | $ 109,714,000 |  |  |  |
2000 Plan, Vicor [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common Stock reserved for issuance |  | 21,852,334 | 20,895,747 | 21,233,659 |

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