Total stock-based compensation related to option issuances was as follows: | | | | | | | | | Three Months Ended March 31, | (in thousands) | | 2026 | | 2025 | Research and development | | $ | 494 | | $ | 607 | Selling, general and administrative | | | 372 | | | 639 | Total stock-based compensation | | $ | 866 | | $ | 1,246 |
Total stock-based compensation related to restricted stock awards and restricted stock units was as follows: | | | | | | | | | Three Months Ended March 31, | (in thousands) | | 2026 | | 2025 | Research and development | | $ | 636 | | $ | 465 | Selling, general and administrative | | | 1,278 | | | 950 | Total stock-based compensation | | $ | 1,914 | | $ | 1,415 |
Total stock-based compensation related to warrants was as follows: | | | | | | | | | Three Months Ended March 31, | (in thousands) | | 2026 | | 2025 | Research and development | | $ | 32 | | $ | 120 | Selling, general and administrative | | | 39 | | | 184 | Total stock-based compensation | | $ | 71 | | $ | 304 |
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