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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | 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 |  |  | $ 937,000 | $ 882,000 | $ 854,000 |
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% |  |  |
Picor Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-qualified stock options |  |  | 10,065,987 | 9,530,987 |  |
Stock options, grants in period |  |  | 673,000 |  |  |
Maturity period of US Treasury Bond |  |  | 7 years |  |  |
Chip options actually vest forfeiture |  |  | 93.00% | 92.00% | 93.00% |
Annual forfeiture rate |  |  | 2.50% | 2.50% | 2.50% |
Share exercisable |  |  | 8,384,987 | 7,915,219 | 8,053,490 |
Weighted average exercise prices |  |  | $ 0.61 | $ 0.62 | $ 0.64 |
Total Intrinsic value |  |  | $ 3,000 | $ 24,000 | $ 72,000 |
Options Exercised |  |  | 5,000 | 17,000 | 14,000 |
Fair value of stock options that vested |  |  | 180,000 | $ 155,000 | $ 39,000 |
Total unrecognized compensation cost |  |  | $ 322,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  | 3 years 1 month 6 days |  |  |
Expected recognized expenses, Year One |  |  | $ 117,000 |  |  |
Expected recognized expenses, Year Two |  |  | 83,000 |  |  |
Expected recognized expenses, Year Three |  |  | 61,000 |  |  |
Expected recognized expenses, Year Four |  |  | 45,000 |  |  |
Expected recognized expenses, Year Five |  |  | $ 16,000 |  |  |
Weighted-average fair value |  |  | $ 0.27 | $ 0.26 | $ 0.48 |
Vi Chip Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-qualified stock options |  |  | 13,092,250 | 9,933,750 |  |
Stock options, grants in period |  |  | 9,771,500 |  |  |
Maturity period of US Treasury Bond |  |  | 7 years |  |  |
Chip options actually vest forfeiture |  |  | 76.00% | 76.00% | 78.00% |
Annual forfeiture rate |  |  | 9.00% | 9.00% | 8.50% |
Share exercisable |  |  | 810,700 | 7,074,650 | 7,042,600 |
Weighted average exercise prices |  |  | $ 1.00 | $ 1.00 | $ 1.00 |
Total Intrinsic value |  |  |  |  | $ 0 |
Options Exercised |  |  | $ 0 | $ 0 | 1,000 |
Fair value of stock options that vested |  |  | 2,900,000 | $ 0 | $ 1,000 |
Total unrecognized compensation cost |  |  | $ 2,395,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  | 4 years |  |  |
Expected recognized expenses, Year One |  |  | $ 603,000 |  |  |
Expected recognized expenses, Year Two |  |  | 544,000 |  |  |
Expected recognized expenses, Year Three |  |  | 503,000 |  |  |
Expected recognized expenses, Year Four |  |  | 483,000 |  |  |
Expected recognized expenses, Year Five |  |  | $ 262,000 |  |  |
Weighted-average fair value |  |  | $ 0.29 | $ 0.01 | $ 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 |  |  | 1,365,917 | 1,696,222 |  |
Stock options, grants in period |  |  | 96,322 |  |  |
Chip options actually vest forfeiture |  |  | 85.00% | 86.00% | 88.00% |
Annual forfeiture rate |  |  | 5.25% | 5.00% | 4.25% |
Share exercisable |  |  | 707,244 | 730,388 | 565,861 |
Weighted average exercise prices |  |  | $ 8.01 | $ 7.74 | $ 7.24 |
Total Intrinsic value |  |  | $ 4,395,000 | $ 1,392,000 | $ 928,000 |
Options Exercised |  |  | 3,295,000 | 1,572,000 | 805,000 |
Fair value of stock options that vested |  |  | 774,000 | $ 365,000 | $ 1,194,000 |
Total unrecognized compensation cost |  |  | $ 920,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  | 1 year 4 months 24 days |  |  |
Expected recognized expenses, Year One |  |  | $ 488,000 |  |  |
Expected recognized expenses, Year Two |  |  | 249,000 |  |  |
Expected recognized expenses, Year Three |  |  | 116,000 |  |  |
Expected recognized expenses, Year Four |  |  | 52,000 |  |  |
Expected recognized expenses, Year Five |  |  | $ 15,000 |  |  |
Weighted-average fair value |  |  | $ 8.71 | $ 4.94 | $ 6.76 |
Stock Bonus Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock purchase by non-employees |  |  | 109,964 |  |  |
2001 Picor Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common Stock reserved for issuance |  |  | 20,000,000 |  |  |
Non-qualified stock options |  |  | 0 |  |  |
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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