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Share-based compensation (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, |
(U.S. Dollars, in thousands) |  | 2020 |  |  | 2019 |
Cost of sales |  | $ | 181 |  |  | $ | 187 |
Sales and marketing |  |  | 696 |  |  |  | 610 |
General and administrative |  |  | 2,530 |  |  |  | 4,564 |
Research and development |  |  | 452 |  |  |  | 324 |
Total |  | $ | 3,859 |  |  | $ | 5,685 |
|  | Three Months Ended March 31, |
(U.S. Dollars, in thousands) |  | 2020 |  |  | 2019 |
Stock options |  | $ | 304 |  |  | $ | 2,112 |
Time-based restricted stock awards and units |  |  | 2,421 |  |  |  | 1,706 |
Market-based restricted stock units |  |  | 670 |  |  |  | 1,347 |
Stock purchase plan |  |  | 464 |  |  |  | 520 |
Total |  | $ | 3,859 |  |  | $ | 5,685 |

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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=116856206&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=116856206&loc=d3e5047-113901 + Details
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