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Share-based compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-based compensation | 10. Share-based compensation The following tables present the detail of share-based compensation by line item in the condensed consolidated statements of income as well as by award type:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Cost of sales |  | $ | 132 |  |  | $ | 137 |  |  | $ | 257 |  |  | $ | 286 |
Sales and marketing |  |  | 473 |  |  |  | 319 |  |  |  | 922 |  |  |  | 679 |
General and administrative |  |  | 4,249 |  |  |  | 2,005 |  |  |  | 7,294 |  |  |  | 4,107 |
Research and development |  |  | 361 |  |  |  | 215 |  |  |  | 658 |  |  |  | 420 |
|  | $ | 5,215 |  |  | $ | 2,676 |  |  | $ | 9,131 |  |  | $ | 5,492 |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Stock options |  | $ | 1,241 |  |  | $ | 523 |  |  | $ | 1,863 |  |  | $ | 1,118 |
Time-based restricted stock awards and units |  |  | 1,789 |  |  |  | 1,239 |  |  |  | 3,236 |  |  |  | 2,531 |
Performance-based restricted stock awards |  |  | 270 |  |  |  | 113 |  |  |  | 759 |  |  |  | 225 |
Performance-based and market-based restricted stock units |  |  | 1,604 |  |  |  | 472 |  |  |  | 2,557 |  |  |  | 938 |
Stock purchase plan |  |  | 311 |  |  |  | 329 |  |  |  | 716 |  |  |  | 680 |
|  | $ | 5,215 |  |  | $ | 2,676 |  |  | $ | 9,131 |  |  | $ | 5,492 |
During the three months ended June 30, 2018 and 2017, the Company issued 80,444 and 76,596 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards. During the six months ended June 30, 2018 and 2017, the Company issued 206,955 and 291,275 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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