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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Stock-Based Compensation Expense | 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 |
Summary of Compensation Expense by Type of Award | 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 Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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