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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | 8. Stock-Based Compensation The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”), as of their grant date. Stock-based compensation expense was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Cost of revenues |  | $ | 73 |  |  | $ | 59 |  |  | $ | 142 |  |  | $ | 115 |
Selling, general and administrative |  |  | 506 |  |  |  | 957 |  |  |  | 1,025 |  |  |  | 1,499 |
Research and development |  |  | 187 |  |  |  | 164 |  |  |  | 372 |  |  |  | 302 |
Total stock-based compensation |  | $ | 766 |  |  | $ | 1,180 |  |  | $ | 1,539 |  |  | $ | 1,916 |
Compensation expense by type of award was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock options |  | $ | 509 |  |  | $ | 1,005 |  |  | $ | 1,042 |  |  | $ | 1,598 |
ESPP |  |  | 257 |  |  |  | 175 |  |  |  | 497 |  |  |  | 318 |
Total stock-based compensation |  | $ | 766 |  |  | $ | 1,180 |  |  | $ | 1,539 |  |  | $ | 1,916 |

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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