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Share-based compensation | 3 Months Ended
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Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Share-based compensation | 13. Share-based compensation Components of share-based compensation expense are as follows:
|  | Three Months Ended March 31, |
(U.S. Dollars, in thousands) |  | 2021 |  |  | 2020 |
Cost of sales |  | $ | 178 |  |  | $ | 181 |
Sales and marketing |  |  | 717 |  |  |  | 696 |
General and administrative |  |  | 2,529 |  |  |  | 2,530 |
Research and development |  |  | 297 |  |  |  | 452 |
Total |  | $ | 3,721 |  |  | $ | 3,859 |
|  | Three Months Ended March 31, |
(U.S. Dollars, in thousands) |  | 2021 |  |  | 2020 |
Stock options |  | $ | 661 |  |  | $ | 304 |
Time-based restricted stock awards and units |  |  | 1,727 |  |  |  | 2,421 |
Market-based restricted stock units |  |  | 897 |  |  |  | 670 |
Stock purchase plan |  |  | 436 |  |  |  | 464 |
Total |  | $ | 3,721 |  |  | $ | 3,859 |
During the three months ended March 31, 2021 and 2020, the Company issued 50,510 and 33,559 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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