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Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Summary of Accrued Liabilities
    As of December 31,  
    2018     2017  
             
Employee-related liabilities   $ 67     $ 64  
Amounts due to certain government institution     220       56  
Other current liabilities     468       330  
    $ 755     $ 450