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Share-based compensation | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Share-based compensation | 12. Share-based compensation Components of share-based compensation expense are as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Cost of sales |  | $ | 205 |  |  | $ | 209 |  |  | $ | 416 |  |  | $ | 387 |
Sales and marketing |  |  | 1,000 |  |  |  | 957 |  |  |  | 1,981 |  |  |  | 1,674 |
General and administrative |  |  | 2,958 |  |  |  | 2,607 |  |  |  | 6,176 |  |  |  | 5,136 |
Research and development |  |  | 297 |  |  |  | 134 |  |  |  | 219 |  |  |  | 431 |
Total |  | $ | 4,460 |  |  | $ | 3,907 |  |  | $ | 8,792 |  |  | $ | 7,628 |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Stock options |  | $ | 205 |  |  | $ | 398 |  |  | $ | 564 |  |  | $ | 1,059 |
Time-based restricted stock awards and units |  |  | 2,410 |  |  |  | 2,019 |  |  |  | 4,580 |  |  |  | 3,746 |
Market-based / performance-based restricted stock units |  |  | 1,497 |  |  |  | 1,053 |  |  |  | 2,941 |  |  |  | 1,950 |
Stock purchase plan |  |  | 348 |  |  |  | 437 |  |  |  | 707 |  |  |  | 873 |
Total |  | $ | 4,460 |  |  | $ | 3,907 |  |  | $ | 8,792 |  |  | $ | 7,628 |
During the three months ended June 30, 2022 and 2021, the Company issued 157,979 and 194,745 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 six months ended June 30, 2022 and 2021, the Company issued 162,864 and 245,255 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI https://asc.fasb.org/topic&trid=2228938 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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