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Share-based compensation | 6 Months Ended
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Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-based compensation | 14. Share-based compensation Components of share-based compensation expense are as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of sales |  | $ | 205 |  |  | $ | 180 |  |  | $ | 386 |  |  | $ | 367 |
Sales and marketing |  |  | 1,533 |  |  |  | 692 |  |  |  | 2,229 |  |  |  | 1,302 |
General and administrative |  |  | 2,639 |  |  |  | 4,564 |  |  |  | 5,169 |  |  |  | 9,128 |
Research and development |  |  | 322 |  |  |  | 413 |  |  |  | 774 |  |  |  | 737 |
Total |  | $ | 4,699 |  |  | $ | 5,849 |  |  | $ | 8,558 |  |  | $ | 11,534 |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(U.S. Dollars, in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock options |  | $ | 750 |  |  | $ | 926 |  |  | $ | 1,054 |  |  | $ | 3,038 |
Time-based restricted stock awards and units |  |  | 2,751 |  |  |  | 2,951 |  |  |  | 5,172 |  |  |  | 4,657 |
Market-based restricted stock units |  |  | 810 |  |  |  | 1,576 |  |  |  | 1,480 |  |  |  | 2,923 |
Stock purchase plan |  |  | 388 |  |  |  | 396 |  |  |  | 852 |  |  |  | 916 |
Total |  | $ | 4,699 |  |  | $ | 5,849 |  |  | $ | 8,558 |  |  | $ | 11,534 |
During the three months ended June 30, 2020 and 2019, the Company issued 152,885 and 40,812 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards and units. During the six months ended June 30, 2020 and 2019, the Company issued 186,444 and 251,893 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards and units.

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- Definition The entire disclosure for share-based payment arrangement. + 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 + Details
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- References No definition available. + Details
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