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Stock-Based Compensation and Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Stock-Based Compensation Expense | Stock-based compensation expense for the years ended December 31 was as follows (in thousands):
|  | 2013 |  |  | 2012 |  |  | 2011 |
Cost of revenues |  | $ | 163 |  |  | $ | 45 |  |  | $ | 68 |
Selling, general and administrative |  |  | 1,942 |  |  |  | 864 |  |  |  | 1,188 |
Research and development |  |  | 345 |  |  |  | 335 |  |  |  | 667 |
Total stock based compensation |  | $ | 2,450 |  |  | $ | 1,244 |  |  | $ | 1,923 |
Weighted-Average Assumptions for Fair Value for Stock Options | The fair value for the options was estimated at the date of grant using a Black-Scholes option pricing model under all methods with the following weighted-average assumptions:
|  | Non Performance- based Stock Options |
Vicor: |  | 2013 |  |  | 2012 |  |  | 2011 |
Risk-free interest rate |  |  | 1.2 | % |  |  | 0.7 | % |  |  | 1.8 | %
Expected dividend yield |  |  | 0.0 | % |  |  | 0.6 | % |  |  | 1.6 | %
Expected volatility |  |  | 39 | % |  |  | 52 | % |  |  | 54 | %
Expected lives (years) |  |  | 4.9 |  |  |  | 4.1 |  |  |  | 5.0 |
VI Chip: |  | 2013 |  |  | 2012 |  |  | 2011 |
Risk-free interest rate |  |  | 1.6 | % |  |  | 1.2 | % |  |  | 1.5 | %
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Expected volatility |  |  | 48 | % |  |  | 50 | % |  |  | 49 | %
Expected lives (years) |  |  | 6.5 |  |  |  | 6.5 |  |  |  | 6.5 |
Picor: |  | 2013 |  |  | 2012 |  |  | 2011 |
Risk-free interest rate |  |  | 1.2 | % |  |  | 1.2 | % |  |  | 1.6 | %
Expected dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Expected volatility |  |  | 49 | % |  |  | 50 | % |  |  | 52 | %
Expected lives (years) |  |  | 6.5 |  |  |  | 6.5 |  |  |  | 6.5 |
Vicor Plan [Member] |
Stock-Based Compensation Expense | A summary of the activity under Vicor’s stock option plans as of December 31, 2013 and changes during the year then ended, is presented below (in thousands except for share and weighted-average data):
|  | Options Outstanding |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |
Outstanding on December 31, 2012 |  |  | 1,796,475 |  |  | $ | 12.99 |  |  |  |  |  |  |  |  |
Granted (1) |  |  | 1,819,345 |  |  | $ | 7.43 |  |  |  |  |  |  |  |  |
Forfeited and expired (1) |  |  | (1,624,142 | ) |  | $ | 13.25 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2,430 | ) |  | $ | 5.41 |  |  |  |  |  |  |  |  |
Outstanding on December 31, 2013 |  |  | 1,989,248 |  |  | $ | 7.71 |  |  |  | 9.18 |  |  | $ | 11,399 |
Exercisable on December 31, 2013 |  |  | 54,284 |  |  | $ | 9.72 |  |  |  | 5.28 |  |  | $ | 217 |
Vested or expected to vest as of December 31, 2013 (2) |  |  | 1,709,313 |  |  | $ | 7.60 |  |  |  | 9.18 |  |  | $ | 9,983 |
(1) | Includes Option Exchange.
(2) | In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest is calculated by applying an estimated forfeiture rate to the unvested options.
Picor Plan [Member] |
Stock-Based Compensation Expense | A summary of the activity under the 2001 Picor Plan as of December 31, 2013 and changes during the year then ended, is presented below (in thousands except for share and weighted-average data):
|  | Options Outstanding |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |
Outstanding on December 31, 2012 |  |  | 10,215,367 |  |  | $ | 0.65 |  |  |  |  |  |  |  |  |
Granted |  |  | 170,000 |  |  | $ | 0.64 |  |  |  |  |  |  |  |  |
Forfeited and expired |  |  | (380,000 | ) |  | $ | 0.25 |  |  |  |  |  |  |  |  |
Exercised |  |  | (601,000 | ) |  | $ | 0.75 |  |  |  |  |  |  |  |  |
Outstanding on December 31, 2013 |  |  | 9,404,367 |  |  | $ | 0.66 |  |  |  | 6.18 |  |  | $ | 351 |
Exercisable on December 31, 2013 |  |  | 5,869,044 |  |  | $ | 0.69 |  |  |  | 5.39 |  |  | $ | 204 |
Vested or expected to vest as of December 31, 2013 (1) |  |  | 9,275,632 |  |  | $ | 0.66 |  |  |  | 6.04 |  |  | $ | 347 |
(1) | In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest is calculated by applying an estimated forfeiture rate to the unvested options.
Vi Chip Plan [Member] |
Stock-Based Compensation Expense | A summary of the activity under the 2007 VI Chip Plan as of December 31, 2013 and changes during the year then ended, is presented below (in thousands except for share and weighted-average data):
|  | Options Outstanding |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |
Outstanding on December 31, 2012 |  |  | 10,525,000 |  |  | $ | 1.00 |  |  |  |  |  |  |  |  |
Granted |  |  | 560,000 |  |  | $ | 1.00 |  |  |  |  |  |  |  |  |
Forfeited and expired |  |  | (340,750 | ) |  | $ | 1.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Outstanding on December 31, 2013 (1) |  |  | 10,744,250 |  |  | $ | 1.00 |  |  |  | 4.78 |  |  | $ | — |
Exercisable on December 31, 2013 |  |  | 7,267,600 |  |  | $ | 1.00 |  |  |  | 3.52 |  |  | $ | — |
Vested or expected to vest as of December 31, 2013 (2) |  |  | 10,273,500 |  |  | $ | 1.00 |  |  |  | 4.66 |  |  | $ | — |
(1) | Of the total VI Chip options outstanding on December 31, 2013, 5,500,000 options have been granted to the Company’s Chief Executive Officer.
(2) | In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest is calculated by applying an estimated forfeiture rate to the unvested options.

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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