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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | 6. 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 |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Cost of revenues |  | $ | 259 |  |  | $ | 296 |  |  | $ | 739 |  |  | $ | 692 |
Selling, general and administrative |  |  | 1,033 |  |  |  | 846 |  |  |  | 2,665 |  |  |  | 2,313 |
Research and development |  |  | 575 |  |  |  | 498 |  |  |  | 1,601 |  |  |  | 1,281 |
Total stock-based compensation |  | $ | 1,867 |  |  | $ | 1,640 |  |  | $ | 5,005 |  |  | $ | 4,286 |
Compensation expense by type of award was as follows (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Stock options |  | $ | 1,661 |  |  | $ | 1,420 |  |  | $ | 4,328 |  |  | $ | 3,663 |
ESPP |  |  | 206 |  |  |  | 220 |  |  |  | 677 |  |  |  | 623 |
Total stock-based compensation |  | $ | 1,867 |  |  | $ | 1,640 |  |  | $ | 5,005 |  |  | $ | 4,286 |
The increase in stock option compensation expense for the three and nine months ended September 30, 2021 compared to the three and nine months ended September 30, 2020, was primarily due to an increase in the number of stock options granted and higher stock-based compensation expense associated with June 2021 stock opti o n awards.

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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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