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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, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | 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 |  |  |  | $ 882,000 | $ 854,000 | $ 877,000 |
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% |  |  |
Two Thousand Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common Stock reserved for issuance |  |  |  | 4,000,000 |  |  |
Stock options, grants in period |  |  | 150,355 |  |  |  |
Stock options, cancelled in period |  |  | (129,028) |  |  |  |
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 |  |  |  | 1,696,222 | 1,848,067 |  |
Stock options, grants in period |  |  |  | 83,817 |  |  |
Stock options, cancelled in period |  |  |  | (18,737) |  |  |
Vicor options actually vest |  |  |  | 86.00% |  |  |
Annual forfeiture rate |  |  |  | 5.00% | 4.25% | 8.00% |
Vicor options actually vest forfeiture |  |  |  |  | 88.00% | 78.00% |
Share exercisable |  |  | 306,173 | 730,388 | 565,861 | 306,173 |
Weighted average exercise prices |  |  | $ 6.90 | $ 7.74 | $ 7.24 | $ 6.90 |
Total Intrinsic value |  |  |  | $ 1,392,000 | $ 928,000 | $ 751,000 |
Options Exercised |  |  |  | 1,572,000 | 805,000 | 788,000 |
Fair value of stock options that vested |  |  |  | 365,000 | $ 1,194,000 | $ 1,096,000 |
Total unrecognized compensation cost |  |  |  | $ 870,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  |  | 1 year 6 months |  |  |
Expected recognized expenses, Year One |  |  |  | $ 490,000 |  |  |
Expected recognized expenses, Year Two |  |  |  | 245,000 |  |  |
Expected recognized expenses, Year Three |  |  |  | 103,000 |  |  |
Expected recognized expenses, Year Four |  |  |  | 28,000 |  |  |
Expected recognized expenses, Year Five |  |  |  | $ 4,000 |  |  |
Weighted-average fair value |  |  |  | $ 4.94 | $ 6.76 | $ 5.50 |
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 |  |  |  | 12,000,000 |  |  |
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 |  |  |  |  |
Picor Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-qualified stock options |  |  |  | 9,530,987 | 9,725,067 |  |
Stock options, grants in period |  |  |  | 603,000 |  |  |
Stock options, cancelled in period |  |  |  | (113,560) |  |  |
Maturity period of US Treasury Bond |  |  |  | 7 years |  |  |
Annual forfeiture rate |  |  |  | 2.50% | 2.50% | 2.75% |
Picor options actually vest forfeiture |  |  |  | 92.00% |  |  |
Picor options actually vest |  |  |  |  | 93.00% | 92.00% |
Share exercisable |  |  | 6,643,377 | 7,915,219 | 8,053,490 | 6,643,377 |
Weighted average exercise prices |  |  | $ 0.67 | $ 0.62 | $ 0.64 | $ 0.67 |
Total Intrinsic value |  |  |  | $ 24,000 | $ 72,000 |  |
Options Exercised |  |  |  | 17,000 | 14,000 | $ 0 |
Fair value of stock options that vested |  |  |  | 155,000 | $ 39,000 | $ 0 |
Total unrecognized compensation cost |  |  |  | $ 285,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  |  | 2 years 9 months 18 days |  |  |
Expected recognized expenses, Year One |  |  |  | $ 116,000 |  |  |
Expected recognized expenses, Year Two |  |  |  | 78,000 |  |  |
Expected recognized expenses, Year Three |  |  |  | 45,000 |  |  |
Expected recognized expenses, Year Four |  |  |  | 29,000 |  |  |
Expected recognized expenses, Year Five |  |  |  | $ 17,000 |  |  |
Weighted-average fair value |  |  |  | $ 0.26 | $ 0.48 | $ 0.19 |
Vi Chip Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-qualified stock options |  |  |  | 9,933,750 | 10,097,500 |  |
Stock options, grants in period |  |  |  | 5,000 |  |  |
Stock options, cancelled in period |  |  |  | (168,750) |  |  |
Maturity period of US Treasury Bond |  |  |  | 7 years |  |  |
Annual forfeiture rate |  |  |  | 9.00% | 8.50% | 7.75% |
Chip options actually vest |  |  |  |  | 78.00% | 77.00% |
Chip options actually vest forfeiture |  |  |  | 76.00% |  |  |
Share exercisable |  |  | 7,377,950 | 7,074,650 | 7,042,600 | 7,377,950 |
Weighted average exercise prices |  |  | $ 1.00 | $ 1.00 | $ 1.00 | $ 1.00 |
Total Intrinsic value |  |  |  |  | $ 0 |  |
Options Exercised |  |  |  | $ 0 | $ 1,000 | $ 0 |
Total unrecognized compensation cost |  |  |  | $ 51,000 |  |  |
Compensation cost recognized over a weighted-average period |  |  |  | 2 years 1 month 6 days |  |  |
Expected recognized expenses, Year One |  |  |  | $ 39,000 |  |  |
Expected recognized expenses, Year Two |  |  |  | $ 12,000 |  |  |
Weighted-average fair value |  |  |  | $ 0.01 | $ 0.01 | $ 0.02 |
Stock Bonus Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock purchase by non-employees |  |  |  | 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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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