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Share-based compensation (Tables) | 6 Months Ended
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Jun. 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 June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of sales |  | $ | 205 |  |  | $ | 180 |  |  | $ | 386 |  |  | $ | 367 |
Sales and marketing |  |  | 1,533 |  |  |  | 692 |  |  |  | 2,229 |  |  |  | 1,302 |
General and administrative |  |  | 2,639 |  |  |  | 4,564 |  |  |  | 5,169 |  |  |  | 9,128 |
Research and development |  |  | 322 |  |  |  | 413 |  |  |  | 774 |  |  |  | 737 |
Total |  | $ | 4,699 |  |  | $ | 5,849 |  |  | $ | 8,558 |  |  | $ | 11,534 |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock options |  | $ | 750 |  |  | $ | 926 |  |  | $ | 1,054 |  |  | $ | 3,038 |
Time-based restricted stock awards and units |  |  | 2,751 |  |  |  | 2,951 |  |  |  | 5,172 |  |  |  | 4,657 |
Market-based restricted stock units |  |  | 810 |  |  |  | 1,576 |  |  |  | 1,480 |  |  |  | 2,923 |
Stock purchase plan |  |  | 388 |  |  |  | 396 |  |  |  | 852 |  |  |  | 916 |
Total |  | $ | 4,699 |  |  | $ | 5,849 |  |  | $ | 8,558 |  |  | $ | 11,534 |

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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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