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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2022
SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION |
Supplemental Information, Balance Sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) |  | 2021 |  | 2022
a. Other assets: |  | ​ |  |  | ​ |
Institutions | ​ | $ | 311 | ​ | $ | 364
Prepaid expenses | ​ |  | 905 | ​ |  | 774
Sundry | ​ |  | 69 | ​ |  | 172
​ | ​ | $ | 1,285 | ​ | $ | 1,310
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) |  | 2021 |  | 2022
b. Accounts payable and accruals – other: |  | ​ |  |  | ​ |
Payroll and related expenses | ​ | $ | 1,562 | ​ | $ | 1,216
Interest payable | ​ |  | 767 | ​ |  | 719
Provision for vacation | ​ |  | 1,506 | ​ |  | 1,404
Accrued expenses | ​ |  | 11,981 | ​ |  | 8,008
Royalties payable | ​ |  | 522 | ​ |  | 781
Property and equipment suppliers | ​ |  | 95 | ​ |  | 143
​ | ​ | $ | 16,433 | ​ | $ | 12,271

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