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Share-based compensation (Tables) | 6 Months Ended
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Jun. 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 June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Cost of sales |  | $ | 180 |  |  | $ | 132 |  |  | $ | 367 |  |  | $ | 257 |
Sales and marketing |  |  | 692 |  |  |  | 473 |  |  |  | 1,302 |  |  |  | 922 |
General and administrative |  |  | 4,564 |  |  |  | 4,249 |  |  |  | 9,128 |  |  |  | 7,294 |
Research and development |  |  | 413 |  |  |  | 361 |  |  |  | 737 |  |  |  | 658 |
Total |  | $ | 5,849 |  |  | $ | 5,215 |  |  | $ | 11,534 |  |  | $ | 9,131 |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock options |  | $ | 926 |  |  | $ | 1,241 |  |  | $ | 3,038 |  |  | $ | 1,863 |
Time-based restricted stock awards and units |  |  | 2,951 |  |  |  | 1,789 |  |  |  | 4,657 |  |  |  | 3,236 |
Performance-based restricted stock awards and units |  |  | — |  |  |  | 270 |  |  |  | — |  |  |  | 759 |
Market-based restricted stock units |  |  | 1,576 |  |  |  | 1,604 |  |  |  | 2,923 |  |  |  | 2,557 |
Stock purchase plan |  |  | 396 |  |  |  | 311 |  |  |  | 916 |  |  |  | 716 |
Total |  | $ | 5,849 |  |  | $ | 5,215 |  |  | $ | 11,534 |  |  | $ | 9,131 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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=109197908&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=109197908&loc=d3e5047-113901 + Details
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