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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 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 March 31, |
|  | 2019 |  |  | 2018 |
Cost of revenues |  | $ | 69 |  |  | $ | 56 |
Selling, general and administrative |  |  | 519 |  |  |  | 542 |
Research and development |  |  | 185 |  |  |  | 138 |
Total stock-based compensation |  | $ | 773 |  |  | $ | 736 |
Compensation expense by type of award was as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Stock options |  | $ | 533 |  |  | $ | 593 |
ESPP |  |  | 240 |  |  |  | 143 |
Total stock-based compensation |  | $ | 773 |  |  | $ | 736 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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