The following tables present details of stock-based compensation and acquisition-related costs included in each functional line item in the condensed consolidated statements of operations above:
| Three Months Ended October 31, | Nine Months Ended October 31, | |||||||||||
| 2021 | 2020 | 2021 | 2020 | |||||||||
| (unaudited, in thousands) | ||||||||||||
| Stock-based compensation: | ||||||||||||
| Cost of revenue | $ | 391 | $ | 368 | $ | 1,073 | $ | 981 | ||||
| Research and development | 13,725 | 11,496 | 36,444 | 31,402 | ||||||||
| Selling, general and administrative | 7,937 | 7,113 | 22,750 | 19,024 | ||||||||
| Total stock-based compensation | $ | 22,053 | $ | 18,977 | $ | 60,267 | $ | 51,407 | ||||
| Three Months Ended October 31, | Nine Months Ended October 31, | |||||||||||
| 2021 | 2020 | 2021 | 2020 | |||||||||
| (unaudited, in thousands) | ||||||||||||
| Acquisition-related costs: | ||||||||||||
| Cost of revenue | $ | 146 | $ | — | $ | 146 | $ | — | ||||
| Research and development | 7 | — | 7 | — | ||||||||
| Selling, general and administrative | 1,601 | — | 1,601 | — | ||||||||
| Total acquisition-related costs | $ | 1,754 | $ | — | $ | 1,754 | $ | — | ||||
