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Share-based compensation | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-based compensation | 13. Share-based compensation Components of share-based compensation expense are as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(U.S. Dollars, in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Cost of sales |  | $ | 200 |  |  | $ | 149 |  |  | $ | 587 |  |  | $ | 535 |
Sales and marketing |  |  | 831 |  |  |  | 668 |  |  |  | 2,505 |  |  |  | 2,897 |
General and administrative |  |  | 2,531 |  |  |  | 2,770 |  |  |  | 7,667 |  |  |  | 7,939 |
Research and development |  |  | 280 |  |  |  | 254 |  |  |  | 711 |  |  |  | 1,028 |
Total |  | $ | 3,842 |  |  | $ | 3,841 |  |  | $ | 11,470 |  |  | $ | 12,399 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(U.S. Dollars, in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Stock options |  | $ | 382 |  |  | $ | 786 |  |  | $ | 1,441 |  |  | $ | 1,840 |
Time-based restricted stock awards and units |  |  | 1,819 |  |  |  | 1,632 |  |  |  | 5,565 |  |  |  | 6,804 |
Market-based restricted stock units |  |  | 1,212 |  |  |  | 1,049 |  |  |  | 3,162 |  |  |  | 2,529 |
Stock purchase plan |  |  | 429 |  |  |  | 374 |  |  |  | 1,302 |  |  |  | 1,226 |
Total |  | $ | 3,842 |  |  | $ | 3,841 |  |  | $ | 11,470 |  |  | $ | 12,399 |
During the three months ended September 30, 2021 and 2020, the Company issued 72,281 and 58,357 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises, and the vesting of restricted stock awards and units. During the nine months ended September 30, 2021 and 2020, the Company issued 317,536 and 244,801 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises, and the vesting of restricted stock awards and units.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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- References No definition available. + Details
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