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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
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) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of sales |  | $ | 149 |  |  | $ | 169 |  |  | $ | 535 |  |  | $ | 536 |
Sales and marketing |  |  | 668 |  |  |  | 583 |  |  |  | 2,897 |  |  |  | 1,885 |
General and administrative |  |  | 2,770 |  |  |  | 4,760 |  |  |  | 7,939 |  |  |  | 13,888 |
Research and development |  |  | 254 |  |  |  | 332 |  |  |  | 1,028 |  |  |  | 1,069 |
Total |  | $ | 3,841 |  |  | $ | 5,844 |  |  | $ | 12,399 |  |  | $ | 17,378 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(U.S. Dollars, in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock options |  | $ | 786 |  |  | $ | 599 |  |  | $ | 1,840 |  |  | $ | 3,637 |
Time-based restricted stock awards and units |  |  | 1,632 |  |  |  | 3,805 |  |  |  | 6,804 |  |  |  | 8,462 |
Market-based restricted stock units |  |  | 1,049 |  |  |  | 1,092 |  |  |  | 2,529 |  |  |  | 4,015 |
Stock purchase plan |  |  | 374 |  |  |  | 348 |  |  |  | 1,226 |  |  |  | 1,264 |
Total |  | $ | 3,841 |  |  | $ | 5,844 |  |  | $ | 12,399 |  |  | $ | 17,378 |

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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=115993241&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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