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Share-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Share-Based Compensation by Line Item in Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) | The following tables present the detail of share-based compensation by line item in the condensed consolidated statements of operations and comprehensive income (loss) as well as by award type:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(U.S. Dollars, in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Cost of sales |  | $ | 169 |  |  | $ | 151 |  |  | $ | 536 |  |  | $ | 408 |
Sales and marketing |  |  | 583 |  |  |  | 514 |  |  |  | 1,885 |  |  |  | 1,436 |
General and administrative |  |  | 4,760 |  |  |  | 4,194 |  |  |  | 13,888 |  |  |  | 11,488 |
Research and development |  |  | 332 |  |  |  | 402 |  |  |  | 1,069 |  |  |  | 1,060 |
Total |  | $ | 5,844 |  |  | $ | 5,261 |  |  | $ | 17,378 |  |  | $ | 14,392 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(U.S. Dollars, in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock options |  | $ | 599 |  |  | $ | 579 |  |  | $ | 3,637 |  |  | $ | 2,442 |
Time-based restricted stock awards and units |  |  | 3,805 |  |  |  | 2,244 |  |  |  | 8,462 |  |  |  | 5,480 |
Performance-based restricted stock awards and units |  |  | — |  |  |  | 734 |  |  |  | — |  |  |  | 1,493 |
Market-based restricted stock units |  |  | 1,092 |  |  |  | 1,298 |  |  |  | 4,015 |  |  |  | 3,855 |
Stock purchase plan |  |  | 348 |  |  |  | 406 |  |  |  | 1,264 |  |  |  | 1,122 |
Total |  | $ | 5,844 |  |  | $ | 5,261 |  |  | $ | 17,378 |  |  | $ | 14,392 |

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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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