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Leases (Tables)
 12 Months Ended
Dec. 31, 2019
Leases [Abstract]  
Schedule of right-of-use assets of lease liabilities
   U.S. dollars in
thousands		 
Amounts recognized in the consolidated balance sheet as of December 31, 2019:     
Right-of-use assets, net  $1,290 
 Current liabilities  $292 
Long-term liabilities   983 
Total operating leased liabilities  $1,275 
Schedule of weighted average lease term and weighted average discount rate
Weighted average lease term     
Operating leases   5.2 years 
Weighted average discount rate     
Operating leases   6.8%
Schedule of cash flows related operating lease liabilities
   U.S. dollars in
thousands		 
Years ending December 31:    
2020  $312 
2021   234 
2022   234 
2023   234 
2024   189 
Thereafter   165 
Total lease payments (undiscounted)   1,368 
Less – discount to net present value   (93)
Present value of lease liabilities  $1,275