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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2020
SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION |
Supplemental Information, Balance Sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) |  | 2019 |  | 2020
a. Other assets: |  | ​ |  |  | ​ |
Institutions | ​ | $ | 604 | ​ | $ | 771
State of Israel (see note 6a) | ​ |  | 26 | ​ |  | ​
Restricted deposits | ​ |  | 820 | ​ |  | 436
Prepaid expenses | ​ |  | 314 | ​ |  | 841
Sundry | ​ |  | 68 | ​ |  | 48
​ | ​ | $ | 1,832 | ​ | $ | 2,096
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(U.S. dollars in thousands) |  | 2019 |  | 2020
b. Accounts payable and accruals – other: |  | ​ |  |  | ​ |
Payroll and related expenses | ​ | $ | 1,381 | ​ | $ | 1,460
Interest payable | ​ |  | 555 | ​ |  | 555
Provision for vacation | ​ |  | 1,754 | ​ |  | 1,526
Accrued expenses | ​ |  | 7,360 | ​ |  | 9,586
Royalties payable | ​ |  | 757 | ​ |  | 482
Property and equipment suppliers | ​ |  | 98 | ​ |  | 317
​ | ​ | $ | 11,905 | ​ | $ | 13,926

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