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Income Taxes - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax Credit Carryforward [Line Items]      
Federal Income tax rate     35.00%
Israeli [Member]      
Tax Credit Carryforward [Line Items]      
Income tax rate     25.00%
Scenario, Forecast [Member] | Israeli [Member]      
Tax Credit Carryforward [Line Items]      
Income tax rate 23.00% 24.00%