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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of loss before taxes on income
     Year Ended December 31, 
     2018   2017   2016 
  Domestic  $(21,784)  $(24,728)  $(32,642)
  Foreign   104    130    142 
     $(21,680)  $(24,598)  $(32,500)
Schedule of taxes on income

     Year Ended December 31, 
     2018   2017   2016 
  Current  $102   $46   $8 
  Deferred   (107)   73    (5)
     $(5)  $119   $3 

 

     Year Ended December 31, 
     2018   2017   2016 
  Domestic  $   $   $ 
  Foreign   (5)   119    3 
     $(5)  $119   $3 
Schedule of deferred income taxes

     December 31, 
     2018   2017 
  Carry forward tax losses  $28,033   $24,969 
  Research and development carry forward expenses-temporary differences   1,567    1,282 
  Accrual and reserves   241    139 
             
  Deferred tax assets before valuation allowance   29,841    26,390 
  Valuation allowance   (29,655)   (26,311)
             
  Net deferred tax assets  $186   $79 

Schedule of net changes in total valuation allowance
     Year Ended December 31, 
     2018   2017   2016 
  Balance at beginning of year  $(26,311)  $(22,560)  $(16,196)
  Changes due to amendments to tax laws and exchange rate differences   1,393    1,806    917,000 
  Adjustment previous year loss       (591)    
  Additions during the year   (4,737)   (4,966)   (7,281)
                  
  Balance at end of year  $(29,655)  $(26,311)  $(22,560)
Schedule of reconciliation between the theoretical tax expense and the actual tax expense (benefit)

     Year Ended December 31, 
     2018   2017   2016 
  Loss before taxes, as reported in the consolidated statements of operations  $(21,680)  $(24,598)  $(32,500)
                  
  Statutory tax rate   23.0%   24.0%   25.0%
                  
  Theoretical tax benefits on the above amount at the Israeli statutory tax rate  $(4,986)  $(5,904)  $(8,125)
  Income tax at rate other than the Israeli statutory tax rate   5    17    10 
  Non-deductible expenses including equity based compensation expenses and other   631    878    857 
  Operating losses and other temporary differences for which valuation allowance was provided   4,737    4,966    7,281 
  Other   (392)   162    (20)
                  
  Actual tax expense  $(5)  $119   $3