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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Tax Credit Carryforward [Line Items]    
Federal Income tax rate 21.00% 21.00%
Net valuation allowance increased $ 3,000,000  
Research and development tax credit carryforwards for federal and state $ 506,000 $ 299,000
Period for which cumulative change in ownership annual use net operating loss and research and development credit carryforwards 3 years  
Accrued interest and penalties associated with uncertain tax positions $ 0 0
Interest or penalties recorded during the year $ 0 0
Minimum [Member]    
Tax Credit Carryforward [Line Items]    
Percentage of cumulative change in ownership 50.00%  
Domestic Tax Authority [Member]    
Tax Credit Carryforward [Line Items]    
Federal net operating loss carryforwards $ 38,600,000 25,000,000
Net operating loss carryforward expiration period 2034  
Federal net operating loss carryforwards, not to expiration $ 13,600,000 12,500,000
Research and development tax credit carryforwards for federal and state $ 764,000 420,000
Research and development tax credit carryforwards expiration period 2025  
State and Local Jurisdiction [Member]    
Tax Credit Carryforward [Line Items]    
State net operating loss carryforwards $ 900,000 900,000
Research and development tax credit carryforwards for federal and state $ 264,000 $ 161,000
Research and development tax credit carryforwards expiration description As of December 31, 2019 and 2018, the Company has state research and development credit carryforwards or approximately $264,000 and $161,000, respectively, which do not expire.  
Israeli Tax Authority [Member] | Foreign Country [Member]    
Tax Credit Carryforward [Line Items]    
Income tax rate 23.00% 23.00%
Foreign operating losses carryforwards $ 8,000,000 $ 8,200,000
California [Member] | State and Local Jurisdiction [Member]    
Tax Credit Carryforward [Line Items]    
Net operating loss carryforward expiration period 2034