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Share-based compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Share-Based Compensation by Line Item in Condensed Consolidated Statements of Operations | The following tables present the detail of share-based compensation by line item in the condensed consolidated statements of operations as well as by award type:
|  | Three Months Ended March 31, |
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |
Cost of sales |  | $ | 125 |  |  | $ | 149 |
Sales and marketing |  |  | 449 |  |  |  | 360 |
General and administrative |  |  | 3,045 |  |  |  | 2,102 |
Research and development |  |  | 297 |  |  |  | 205 |
|  | $ | 3,916 |  |  | $ | 2,816 |
|  | Three Months Ended March 31, |
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |
Stock options |  | $ | 622 |  |  | $ | 595 |
Time-based restricted stock awards |  |  | 1,447 |  |  |  | 1,292 |
Performance-based restricted stock awards |  |  | 489 |  |  |  | 112 |
Performance-based and market-based restricted stock units |  |  | 953 |  |  |  | 466 |
Stock purchase plan |  |  | 405 |  |  |  | 351 |
|  | $ | 3,916 |  |  | $ | 2,816 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + Details
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