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Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 11, 2011 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2010
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 |  |  | $ 976,000 | $ 937,000 | $ 882,000 |
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% |  |  |
Vi Chip Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-qualified stock options |  |  | 10,414,000 | 13,092,250 |  |
Stock options, grants in period |  |  | 0 |  |  |
Maturity period of US Treasury Bond |  |  | 7 years |  |  |
Chip options actually vest forfeiture |  |  | 89.00% | 76.00% | 76.00% |
Annual forfeiture rate |  |  | 4.25% | 9.00% | 9.00% |
Share exercisable |  |  | 2,743,400 | 810,700 | 7,074,650 |
Weighted average exercise prices |  |  | $ 0.97 | $ 1.00 | $ 1.00 |
Options Exercised |  |  | $ 0 | $ 0 | $ 0 |
Fair value of stock options that vested |  |  | 0 | $ 2,900,000 | $ 0 |
Total unrecognized compensation cost |  |  | $ 1,792,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  | 3 years 4 months 24 days |  |  |
Expected recognized expenses, Year One |  |  | $ 544,000 |  |  |
Expected recognized expenses, Year Two |  |  | 503,000 |  |  |
Expected recognized expenses, Year Three |  |  | 483,000 |  |  |
Expected recognized expenses, Year Four |  |  | $ 262,000 |  |  |
Weighted-average fair value |  |  |  | $ 0.29 | $ 0.01 |
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% |  |  |
Non-qualified stock options |  |  | 1,382,981 | 1,365,917 |  |
Stock options, grants in period |  |  | 684,077 |  |  |
Chip options actually vest forfeiture |  |  | 85.00% | 85.00% | 86.00% |
Annual forfeiture rate |  |  | 5.25% | 5.25% | 5.00% |
Share exercisable |  |  | 888,257 | 707,244 | 730,388 |
Weighted average exercise prices |  |  | $ 8.93 | $ 8.01 | $ 7.74 |
Total Intrinsic value |  |  | $ 22,938,000 | $ 4,395,000 | $ 1,392,000 |
Options Exercised |  |  | 6,782,000 | 3,295,000 | 1,572,000 |
Fair value of stock options that vested |  |  | 2,921,000 | $ 774,000 | $ 365,000 |
Total unrecognized compensation cost |  |  | $ 2,487,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  | 1 year 10 months 24 days |  |  |
Expected recognized expenses, Year One |  |  | $ 1,183,000 |  |  |
Expected recognized expenses, Year Two |  |  | 689,000 |  |  |
Expected recognized expenses, Year Three |  |  | 395,000 |  |  |
Expected recognized expenses, Year Four |  |  | 180,000 |  |  |
Expected recognized expenses, Year Five |  |  | $ 40,000 |  |  |
Weighted-average fair value |  |  | $ 17.46 | $ 8.71 | $ 4.94 |
Stock Bonus Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock purchase by non-employees |  |  | 109,964 |  |  |
2007 VI Chip Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common Stock reserved for issuance |  |  | 14,000,000 |  |  |
Non-qualified stock options |  |  | 0 |  |  | 2,984,250
Stock options, grants in period | 0 |  |  |  |  |
Stock-based compensation expense reversed |  | $ 768,000 |  |  |  |
2007 VI Chip Plan [Member] | Cost of Revenues [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Decrease in costs and expenses due to reversal of share-based compensation expense |  | 86,000 |  |  |  |
2007 VI Chip Plan [Member] | Selling, General and Administrative [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Decrease in costs and expenses due to reversal of share-based compensation expense |  | 516,000 |  |  |  |
2007 VI Chip Plan [Member] | Research and Development [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Decrease in costs and expenses due to reversal of share-based compensation expense |  | $ 166,000 |  |  |  |
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 Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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