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Significant Accounting Policies -Summary of Cumulative Effect of Adoption on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net revenues | $ 63,125 | $ 70,772 | $ 63,355 | $ 65,725 | $ 73,720 | $ 78,035 | $ 74,196 | $ 65,269 | $ 262,977 | $ 291,220 | $ 227,830
Cost of revenues |  |  |  |  |  |  |  |  | 140,011 | 152,249 | 126,174
Gross margin | 29,761 | 33,002 | 29,117 | 31,086 | 33,873 | 39,004 | 35,883 | 30,211 | 122,966 | 138,971 | 101,656
Income before income taxes |  |  |  |  |  |  |  |  | 14,887 | 32,933 | (98)
Provision for income taxes |  |  |  |  |  |  |  |  | 778 | 1,087 | (356)
Consolidated net income | 1,315 | 5,932 | 2,556 | 4,306 | 6,907 | 13,048 | 7,909 | 3,982 | 14,109 | 31,846 | 258
Net income attributable to Vicor Corporation | $ 1,312 | $ 5,937 | $ 2,563 | $ 4,286 | $ 6,910 | $ 13,012 | $ 7,860 | $ 3,943 | $ 14,098 | 31,725 | $ 167
Accounting Standards Update 2014-09 [Member] | Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | (3,946) |
Cost of revenues |  |  |  |  |  |  |  |  |  | (2,149) |
Gross margin |  |  |  |  |  |  |  |  |  | (1,797) |
Income before income taxes |  |  |  |  |  |  |  |  |  | (1,797) |
Provision for income taxes |  |  |  |  |  |  |  |  |  | (59) |
Consolidated net income |  |  |  |  |  |  |  |  |  | (1,738) |
Net income attributable to Vicor Corporation |  |  |  |  |  |  |  |  |  | (1,738) |
Accounting Standards Update 2014-09 [Member] | Balances without adoption of Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 287,274 |
Cost of revenues |  |  |  |  |  |  |  |  |  | 150,100 |
Gross margin |  |  |  |  |  |  |  |  |  | 137,174 |
Income before income taxes |  |  |  |  |  |  |  |  |  | 31,136 |
Provision for income taxes |  |  |  |  |  |  |  |  |  | 1,028 |
Consolidated net income |  |  |  |  |  |  |  |  |  | 30,108 |
Net income attributable to Vicor Corporation |  |  |  |  |  |  |  |  |  | $ 29,987 |

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