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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Stock-Based Compensation Expense | Stock-based compensation expense was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Cost of revenues |  | $ | 252 |  |  | $ | 277 |  |  | $ | 480 |  |  | $ | 396 |
Selling, general and administrative |  |  | 779 |  |  |  | 1,030 |  |  |  | 1,632 |  |  |  | 1,467 |
Research and development |  |  | 536 |  |  |  | 629 |  |  |  | 1,026 |  |  |  | 783 |
Total stock-based compensation |  | $ | 1,567 |  |  | $ | 1,936 |  |  | $ | 3,138 |  |  | $ | 2,646 |
Summary of Compensation Expense by Type of Award | Compensation expense by type of award was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Stock options |  | $ | 1,336 |  |  | $ | 1,737 |  |  | $ | 2,667 |  |  | $ | 2,243 |
ESPP |  |  | 231 |  |  |  | 199 |  |  |  | 471 |  |  |  | 403 |
Total stock-based compensation |  | $ | 1,567 |  |  | $ | 1,936 |  |  | $ | 3,138 |  |  | $ | 2,646 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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