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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Components of Share-Based Compensation Expense | 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 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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