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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue, Major Customer [Line Items] |
Summary of Cumulative Effect of Adoption on Consolidated Statement of Operations |
a) | Consolidated Balance Sheet Items
|  | As of December 31, 2018 |
|  | As reported |  |  | Adjustments |  |  | Balances without adoption of Topic 606 |
Accounts receivable, net |  | $ | 43,673 |  |  | $ | (72 | ) |  | $ | 43,601 |
Inventories, net |  |  | 47,370 |  |  |  | (110 | ) |  |  | 47,260 |
Total assets |  |  | 221,068 |  |  |  | (182 | ) |  |  | 220,886 |
Income taxes payable |  |  | 710 |  |  |  | (59 | ) |  |  | 651 |
Deferred revenue |  |  | 5,069 |  |  |  | 5,768 |  |  |  | 10,837 |
Sales allowances |  |  | 548 |  |  |  | (483 | ) |  |  | 65 |
Total liabilities |  |  | 36,978 |  |  |  | 5,226 |  |  |  | 42,204 |
Retained earnings |  |  | 129,000 |  |  |  | (5,408 | ) |  |  | 123,592 |
Total equity |  |  | 184,090 |  |  |  | (5,408 | ) |  |  | 178,682 |
Total liabilities and equity |  |  | 221,068 |  |  |  | (182 | ) |  |  | 220,886 |
b) | Consolidated Statement of Operations Items
|  | Year Ended December 31, 2018 |
|  | As reported |  |  | Adjustments |  |  | Balances without adoption of Topic 606 |
Net revenues |  | $ | 291,220 |  |  |  | $(3,946) |  |  | $ | 287,274 |
Cost of revenues |  |  | 152,249 |  |  |  | (2,149 | ) |  |  | 150,100 |
Gross margin |  |  | 138,971 |  |  |  | (1,797 | ) |  |  | 137,174 |
Income before income taxes |  |  | 32,933 |  |  |  | (1,797 | ) |  |  | 31,136 |
Provision for income taxes |  |  | 1,087 |  |  |  | (59 | ) |  |  | 1,028 |
Consolidated net income |  |  | 31,846 |  |  |  | (1,738 | ) |  |  | 30,108 |
Net income attributable to Vicor Corporation |  |  | 31,725 |  |  |  | (1,738 | ) |  |  | 29,987 |
Computation Of Basic And Diluted Net Income (Loss) Per Share | The following table sets forth the computation of basic and diluted net income per share for the years ended December 31 (in thousands, except per share amounts):
|  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Vicor Corporation |  | $ | 14,098 |  |  | $ | 31,725 |  |  | $ | 167 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic net income per share-weighted average shares (1) |  |  | 40,330 |  |  |  | 39,872 |  |  |  | 39,228 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options (2) |  |  | 1,347 |  |  |  | 857 |  |  |  | 705 |
Denominator for diluted net income per share-adjusted weighted-average shares and assumed conversions (3) |  |  | 41,677 |  |  |  | 40,729 |  |  |  | 39,933 |
Basic net income per share |  | $ | 0.35 |  |  | $ | 0.80 |  |  | $ | 0.00 |
Diluted net income per share |  | $ | 0.34 |  |  | $ | 0.78 |  |  | $ | 0.00 |
(1) | Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding.
(2) | Options to purchase 164,367, 67,247 and 53,913 shares of Common Stock in 2019, 2018, and 2017, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.
(3) | Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding for the year, adjusted to include the dilutive effect, if any, of outstanding options.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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