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Share-based compensation | 3 Months Ended
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Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-based compensation | 14. Share-based compensation 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 March 31, |
(U.S. Dollars, in thousands) |  | 2019 |  |  | 2018 |
Cost of sales |  | $ | 187 |  |  | $ | 125 |
Sales and marketing |  |  | 610 |  |  |  | 449 |
General and administrative |  |  | 4,564 |  |  |  | 3,045 |
Research and development |  |  | 324 |  |  |  | 297 |
Total |  | $ | 5,685 |  |  | $ | 3,916 |
|  | Three Months Ended March 31, |
(U.S. Dollars, in thousands) |  | 2019 |  |  | 2018 |
Stock options |  | $ | 2,112 |  |  | $ | 622 |
Time-based restricted stock awards and units |  |  | 1,706 |  |  |  | 1,447 |
Performance-based restricted stock awards and units |  |  | — |  |  |  | 489 |
Market-based restricted stock units |  |  | 1,347 |  |  |  | 953 |
Stock purchase plan |  |  | 520 |  |  |  | 405 |
Total |  | $ | 5,685 |  |  | $ | 3,916 |
During the three months ended March 31, 2019 and 2018, the Company issued 211,081 and 126,511 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards and units. Share-Based Compensation Modifications During the first quarter of 2019, the Company entered into a Transition and Retirement Agreement (the “Retirement Agreement”) with the Company’s President and Chief Executive Officer. As part of the Retirement Agreement, certain time-based stock options and restricted stock awards were modified to accelerate the vesting to the retirement date. In addition, stock options were modified to extend the post-termination exercise period from 18 months under a standard qualified retirement to up to four years, dependent upon the remaining contractual term of the options. The Company recognized approximately $2.1 million in share-based compensation expense during the three months ended March 31, 2019, related to the Retirement Agreement which was charged to general and administrative expense in the condensed consolidated statements of operations and comprehensive income (loss).

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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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