| Schedule of composition of property and equipment and accumulated depreciation | 
|  |  | Cost |  |  | Accumulated depreciation |  |  |  |  |  
|  |  | Carryingamount at
 beginning of year
 |  |  | Additions |  |  | Carryingamount at
 end of year
 |  |  | Carrying amount at
 beginning of year
 |  |  | Additions |  |  | Carryingamount at
 end of year
 |  |  | Depreciated balance as at
 December 31,
 2015
 |  |  
|  |  | NIS in thousands |  |  | NIS in thousands |  |  | NIS in thousands
 |  |  
| Computer equipment |  |  | 598 |  |  |  | 64 |  |  |  | 662 |  |  |  | 520 |  |  |  | 49 |  |  |  | 569 |  |  |  | 93 |  |  
| Office furniture |  |  | 438 |  |  |  | 58 |  |  |  | 496 |  |  |  | 161 |  |  |  | 26 |  |  |  | 187 |  |  |  | 309 |  |  
| Laboratory equipment |  |  | 3,983 |  |  |  | 1,200 |  |  |  | 5,183 |  |  |  | 3,371 |  |  |  | 355 |  |  |  | 3,726 |  |  |  | 1,457 |  |  
| Greenhouse equipment |  |  | 2,982 |  |  |  | — |  |  |  | 2,982 |  |  |  | 2,199 |  |  |  | 260 |  |  |  | 2,459 |  |  |  | 523 |  |  
| Leasehold improvements |  |  | 976 |  |  |  | 67 |  |  |  | 1,043 |  |  |  | 719 |  |  |  | 94 |  |  |  | 813 |  |  |  | 230 |  |  
|  |  |  | 8,977 |  |  |  | 1,389 |  |  |  | 10,366 |  |  |  | 6,970 |  |  |  | 784 |  |  |  | 7,754 |  |  |  | 2,612 |  |    
|  |  | Costs |  |  | Accumulated depreciation |  |  |  |  |  
|  |  | Carrying amount at
 beginning of year
 |  |  | Additions |  |  | Carrying amount at
 end
 of year
 |  |  | Carrying amount at
 beginning of year
 |  |  | Additions |  |  | Carrying amount at
 end of year
 |  |  | Depreciated balance as at
 December 31,
 2016
 |  |  
|  |  | NIS in thousands |  |  | NIS in thousands |  |  | NIS in thousands
 |  |  
| Computer equipment |  |  | 662 |  |  |  | 40 |  |  |  | 702 |  |  |  | 569 |  |  |  | 54 |  |  |  | 623 |  |  |  | 79 |  |  
| Office furniture |  |  | 496 |  |  |  | 4 |  |  |  | 500 |  |  |  | 187 |  |  |  | 27 |  |  |  | 214 |  |  |  | 286 |  |  
| Laboratory equipment |  |  | 5,183 |  |  |  | 284 |  |  |  | 5,467 |  |  |  | 3,726 |  |  |  | 400 |  |  |  | 4,126 |  |  |  | 1,341 |  |  
| Greenhouse equipment |  |  | 2,982 |  |  |  | — |  |  |  | 2,982 |  |  |  | 2,459 |  |  |  | 254 |  |  |  | 2,713 |  |  |  | 269 |  |  
| Leasehold improvements |  |  | 1,043 |  |  |  | 1,842 |  |  |  | 2,885 |  |  |  | 813 |  |  |  | 39 |  |  |  | 852 |  |  |  | 2,033 |  |  
|  |  |  | 10,366 |  |  |  | 2,170 |  |  |  | 12,536 |  |  |  | 7,754 |  |  |  | 774 |  |  |  | 8,528 |  |  |  | 4,008 |  |     
|  |  | Costs |  |  | Accumulated depreciation |  |  |  |  |  
|  |  | Carrying amount at
 beginning of year
 |  |  | Additions |  |  | Carrying amount at
 end
 of year
 |  |  | Carrying amount at
 beginning of year
 |  |  | Additions |  |  | Carrying amount at
 end
 of year
 |  |  | Depreciated balance as at
 December 31,
 2017
 |  |  
|  |  | NIS in thousands |  |  | NIS in thousands |  |  | NIS in thousands
 |  |  
| Computer equipment |  |  | 702 |  |  |  | 16 |  |  |  | 718 |  |  |  | 623 |  |  |  | 44 |  |  |  | 667 |  |  |  | 51 |  |  
| Office furniture |  |  | 500 |  |  |  | 1 |  |  |  | 501 |  |  |  | 214 |  |  |  | 27 |  |  |  | 241 |  |  |  | 260 |  |  
| Laboratory equipment |  |  | 5,467 |  |  |  | 68 |  |  |  | 5,535 |  |  |  | 4,126 |  |  |  | 420 |  |  |  | 4,546 |  |  |  | 989 |  |  
| Greenhouse equipment |  |  | 2,982 |  |  |  | — |  |  |  | 2,982 |  |  |  | 2,713 |  |  |  | 207 |  |  |  | 2,920 |  |  |  | 62 |  |  
| Leasehold improvements |  |  | 2,885 |  |  |  | 362 |  |  |  | 3,247 |  |  |  | 852 |  |  |  | 175 |  |  |  | 1,027 |  |  |  | 2,220 |  |  
|  |  |  | 12,536 |  |  |  | 447 |  |  |  | 12,983 |  |  |  | 8,528 |  |  |  | 873 |  |  |  | 9,401 |  |  |  | 3,582 |  |  |