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Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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Jun. 21, 2013 $ / shares shares | Jun. 17, 2013 Participant $ / shares shares | May. 14, 2013 $ / shares shares | Nov. 11, 2011 shares | Dec. 31, 2014 $ / shares shares | Jun. 30, 2013 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2010 shares | Sep. 30, 2010 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of Option |  |  |  |  |  |  | 10 years |  |  |  |
Eligible participants | Participant |  | 638 |  |  |  |  |  |  |  |  |
Options to purchase shares of Common Stock | shares |  | 1,531,077 |  |  |  |  |  |  |  |  |
Percentage of common stock |  | 91.00% |  |  |  |  |  |  |  |  |
Replacement option vesting period |  | 5 years |  |  |  |  |  |  |  |  |
Replacement option expiration period |  | 10 years |  |  |  |  |  |  |  |  |
Incremental expenses |  |  |  |  |  |  | $ 365,000 |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | 318,000 |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  | $ 1,782,000 | $ 1,634,000 | $ 2,450,000 |  |
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 |  |  |  |  |  |  | $ 854,000 | $ 877,000 | $ 825,000 |  |
Performance Based Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options | shares |  |  |  |  |  |  | 44,500 |  |  |  |
Time-Based eligible Option exercise price | $ / shares |  | $ 6.29 |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | $ 370,000 |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  | $ 2,300,000 |  |  |  |
Time Based Option [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Time-Based eligible Option exercise price | $ / shares |  | $ 6.29 |  |  |  |  |  |  |  |  |
Tranche One [Member] | Performance Based Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options granted to non-employees |  | 120.00% |  |  |  |  |  |  |  |  |
Common stock sales price | $ / shares |  | $ 6.29 |  |  |  |  |  |  |  |  |
Tranche One [Member] | Time Based Option [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options granted to non-employees |  | 120.00% |  |  |  |  |  |  |  |  |
Tranche Two [Member] | Performance Based Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options granted to non-employees |  | 140.00% |  |  |  |  |  |  |  |  |
Common stock sales price | $ / shares |  | $ 7.34 |  |  |  |  |  |  |  |  |
Tranche Three [Member] | Performance Based Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options granted to non-employees |  | 160.00% |  |  |  |  |  |  |  |  |
Common stock sales price | $ / shares |  | $ 8.38 |  |  |  |  |  |  |  |  |
Tranche Four [Member] | Performance Based Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options granted to non-employees |  | 180.00% |  |  |  |  |  |  |  |  |
Common stock sales price | $ / shares |  | $ 9.43 |  |  |  |  |  |  |  |  |
Tranche Five [Member] | Performance Based Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options granted to non-employees |  | 200.00% |  |  |  |  |  |  |  |  |
Common stock sales price | $ / shares |  | $ 10.48 |  |  |  |  |  |  |  |  |
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% |  |  |  |
Two Thousand Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock reserved for issuance | shares |  |  |  |  |  |  | 4,000,000 |  |  |  |
Non-qualified stock options | shares |  |  |  |  |  |  |  |  |  |  | 1,243,750
Common stock options awarded | shares | 70,552 |  | 150,000 |  | 150,355 |  |  |  |  |  |
Incremental expenses |  |  |  |  |  | $ 208,000 |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | $ 279,000 |  |  |  |
Immediate expense recognition |  |  |  |  |  | 190,000 |  |  |  |  |
Exercise price of options awarded | $ / shares | $ 5.67 |  | $ 5.35 |  |  |  |  |  |  |  |
Stock options, cancelled in period | shares |  |  |  |  | (129,028) |  |  |  |  |  |
Two Thousand Plan [Member] | Employees and Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental expenses |  |  |  |  |  | 625,000 |  |  |  |  |
Age of employees |  |  |  |  |  |  | 62 years 6 months |  |  |  |
Immediate expense recognition |  |  |  |  |  | $ 450,000 |  |  |  |  |
Vicor Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options granted to non-employees |  |  |  |  |  |  | 85.00% |  |  |  |
Non-qualified stock options | shares |  |  |  |  | 1,895,675 |  | 1,848,067 | 1,895,675 |  |  |
Common stock options awarded | shares |  |  |  |  |  |  | 194,561 |  |  |  |
Common stock sales price | $ / shares |  |  |  |  |  |  | $ 12.51 |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | $ 1,393,000 |  |  |  |
Stock options, cancelled in period | shares |  |  |  |  |  |  | (117,085) |  |  |  |
Vicor options actually vest |  |  |  |  |  |  | 88.00% |  |  |  |
Annual forfeiture rate |  |  |  |  |  |  | 4.25% | 8.00% | 8.00% |  |
Vicor options actually vest forfeiture |  |  |  |  |  |  |  | 78.00% | 78.00% |  |
Share exercisable | shares |  |  |  |  | 306,173 |  | 565,861 | 306,173 | 54,284 |  |
Weighted average exercise prices | $ / shares |  |  |  |  | $ 6.90 |  | $ 7.24 | $ 6.90 | $ 9.72 |  |
Total Intrinsic value |  |  |  |  |  |  | $ 928,000 | $ 751,000 | $ 15,000 |  |
Options Exercised |  |  |  |  |  |  | 805,000 | 788,000 | 13,000 |  |
Fair value of stock options that vested |  |  |  |  |  |  | $ 1,194,000 | $ 1,096,000 | $ 489,000 |  |
Compensation cost recognized over a weighted-average period |  |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |
Expected recognized expenses, Year One |  |  |  |  |  |  | $ 726,000 |  |  |  |
Expected recognized expenses, Year Two |  |  |  |  |  |  | 397,000 |  |  |  |
Expected recognized expenses, Year Three |  |  |  |  |  |  | 186,000 |  |  |  |
Expected recognized expenses, Year Four |  |  |  |  |  |  | 71,000 |  |  |  |
Expected recognized expenses, Year Five |  |  |  |  |  |  | $ 13,000 |  |  |  |
Weighted-average fair value | $ / shares |  |  |  |  |  |  | $ 6.76 | $ 5.50 | $ 1.90 |  |
Intrinsic value of option exercised |  |  |  |  |  |  | $ 1,269,000 |  |  |  |
2001 Picor Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock reserved for issuance | shares |  |  |  |  |  |  | 20,000,000 |  |  |  |
Non-qualified stock options | shares |  |  |  |  | 0 |  |  | 0 |  |  |
2007 VI Chip Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock reserved for issuance | shares |  |  |  |  |  |  | 12,000,000 |  |  |  |
Non-qualified stock options | shares |  |  |  |  |  |  | 0 |  |  | 2,984,250 |
Common stock options awarded | shares |  |  |  | 0 |  |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | $ 485,000 |  |  |  |
Picor Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options | shares |  |  |  |  | 9,870,067 |  | 9,725,067 | 9,870,067 |  |  |
Common stock options awarded | shares |  |  |  |  |  |  | 82,000 |  |  |  |
Common stock sales price | $ / shares |  |  |  |  |  |  | $ 1.09 |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | $ 307,000 |  |  |  |
Stock options, cancelled in period | shares |  |  |  |  |  |  | (8,000) |  |  |  |
Maturity period of US Treasury Bond |  |  |  |  |  |  | 7 years |  |  |  |
Annual forfeiture rate |  |  |  |  |  |  | 2.50% | 2.75% | 2.75% |  |
Picor options actually vest forfeiture |  |  |  |  |  |  | 93.00% |  |  |  |
Picor options actually vest |  |  |  |  |  |  |  | 92.00% | 92.00% |  |
Share exercisable | shares |  |  |  |  | 6,643,377 |  | 8,053,490 | 6,643,377 | 5,869,044 |  |
Weighted average exercise prices | $ / shares |  |  |  |  | $ 0.67 |  | $ 0.64 | $ 0.67 | $ 0.69 |  |
Total Intrinsic value |  |  |  |  |  |  | $ 72,000 | $ 0 | $ 146,000 |  |
Options Exercised |  |  |  |  |  |  | 14,000 |  | 14,000 |  |
Fair value of stock options that vested |  |  |  |  |  |  | $ 39,000 | $ 0 | $ 398,000 |  |
Compensation cost recognized over a weighted-average period |  |  |  |  |  |  | 2 years 7 months 6 days |  |  |  |
Expected recognized expenses, Year One |  |  |  |  |  |  | $ 148,000 |  |  |  |
Expected recognized expenses, Year Two |  |  |  |  |  |  | 86,000 |  |  |  |
Expected recognized expenses, Year Three |  |  |  |  |  |  | 51,000 |  |  |  |
Expected recognized expenses, Year Four |  |  |  |  |  |  | 19,000 |  |  |  |
Expected recognized expenses, Year Five |  |  |  |  |  |  | $ 3,000 |  |  |  |
Weighted-average fair value | $ / shares |  |  |  |  |  |  | $ 0.48 | $ 0.19 | $ 0.31 |  |
Intrinsic value of option exercised |  |  |  |  |  |  | $ 3,594,000 |  |  |  |
Vi Chip Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-qualified stock options | shares |  |  |  |  | 10,715,000 |  | 10,097,500 | 10,715,000 |  |  |
Common stock options awarded | shares |  |  |  |  |  |  | 82,500 |  |  |  |
Common stock sales price | $ / shares |  |  |  |  |  |  | $ 1.00 |  |  |  |
Total unrecognized compensation cost |  |  |  |  |  |  | $ 589,000 |  |  |  |
Stock options, cancelled in period | shares |  |  |  |  |  |  | (699,000) |  |  |  |
Maturity period of US Treasury Bond |  |  |  |  |  |  | 7 years |  |  |  |
Annual forfeiture rate |  |  |  |  |  |  | 8.50% | 7.75% | 7.00% |  |
Chip options actually vest |  |  |  |  |  |  |  | 77.00% | 80.00% |  |
Chip options actually vest forfeiture |  |  |  |  |  |  | 78.00% |  |  |  |
Share exercisable | shares |  |  |  |  | 7,377,950 |  | 7,042,600 | 7,377,950 | 7,267,600 |  |
Weighted average exercise prices | $ / shares |  |  |  |  | $ 1.00 |  | $ 1.00 | $ 1.00 | $ 1.00 |  |
Options Exercised |  |  |  |  |  |  | $ 1,000 | $ 0 | $ 0 |  |
Compensation cost recognized over a weighted-average period |  |  |  |  |  |  | 3 years |  |  |  |
Expected recognized expenses, Year One |  |  |  |  |  |  | $ 192,000 |  |  |  |
Expected recognized expenses, Year Two |  |  |  |  |  |  | 178,000 |  |  |  |
Expected recognized expenses, Year Three |  |  |  |  |  |  | 150,000 |  |  |  |
Expected recognized expenses, Year Four |  |  |  |  |  |  | $ 69,000 |  |  |  |
Weighted-average fair value | $ / shares |  |  |  |  |  |  | $ 0.01 | $ 0.02 | $ 0.29 |  |
Intrinsic value of option exercised |  |  |  |  |  |  | $ 0 |  |  |  |
Stock Bonus Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock purchase by non-employees | shares |  |  |  |  |  |  | 109,964 |  |  |  |

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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Plan -URI http://asc.fasb.org/extlink&oid=49180617 + Details
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