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Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term of Option | 10 years |  |
Employee's compensation plan | The Company matches employee contributions to the plan at a rate of 50%, up to the first 3% of an employee’s compensation. |  |
Employee contributions | 20.00% |  |
Company contribution to the plan | $ 1,001,000 | $ 976,000 | $ 937,000
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employees pre-tax salary | 1.00% |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employees pre-tax salary | 80.00% |  |
2000 Plan, Vicor [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common Stock reserved for issuance | 10,000,000 |  |
Non-qualified stock options granted to non-employees | 85.00% |  |
Annual forfeiture rate | 5.25% | 5.25% | 5.25%
Share exercisable | 1,475,947 | 888,257 | 707,244
Weighted average exercise prices | $ 8.74 | $ 8.93 | $ 8.01
Total Intrinsic value | $ 6,636,000 | $ 22,938,000 | $ 4,395,000
Options Exercised | 2,437,000 | 6,782,000 | 3,295,000
Fair value of stock options that vested | 1,657,000 | $ 2,921,000 | $ 774,000
Total unrecognized compensation cost | $ 4,121,000 |  |
Compensation cost recognized over a weighted-average period | 1 year 8 months 12 days |  |
Expected recognized expenses, Year One | $ 1,897,000 |  |
Expected recognized expenses, Year Two | 1,261,000 |  |
Expected recognized expenses, Year Three | 669,000 |  |
Expected recognized expenses, Year Four | 184,000 |  |
Expected recognized expenses, Year Five | $ 110,000 |  |
Weighted-average fair value | $ 14.30 | $ 17.46 | $ 8.71
Stock Bonus Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock purchase by non-employees | 109,964 |  |
2017 Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-qualified stock options granted to non-employees | 85.00% |  |
Maximum number of shares authorized for issuances | 2,000,000 |  |
Maximum percentage of payroll deductions on employee's compensation | 15.00% |  |
Offering period of employee stock purchase plan | 6 months |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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