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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Tax Credit Carryforward [Line Items]    
Federal Income tax rate 21.00% 21.00%
Net valuation allowance decreased $ (5,100,000)  
Research and development tax credit carryforwards for federal and state $ 705,000 $ 506,000
Period for which cumulative change in ownership annual use net operating loss and research and development credit carryforwards 3 years  
Section 382 limitation on net operating losses and R&D credit carryforwards $ 10,562,000  
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 $ 14,400,000 38,600,000
Net operating loss carryforward expiration period 2035  
Federal net operating loss carryforwards, not to expiration $ 13,600,000  
Research and development tax credit carryforwards for federal and state $ 966,000 764,000
Research and development tax credit carryforwards expiration period 2035  
State and Local Jurisdiction [Member]    
Tax Credit Carryforward [Line Items]    
State net operating loss carryforwards $ 6,200,000 900,000
Research and development tax credit carryforwards for federal and state $ 562,000 264,000
Research and development tax credit carryforwards expiration period 2030  
Research and development tax credit carryforwards expiration description As of December 31, 2020 and 2019, the Company has state research and development credit carryforwards or approximately $562,000 and $264,000, respectively, which will begin expiring in 2030 if not utilized.  
Israeli Tax Authority [Member] | Foreign Country [Member]    
Tax Credit Carryforward [Line Items]    
Income tax rate 23.00%  
Foreign operating losses carryforwards $ 7,900,000 $ 8,000,000
California [Member] | State and Local Jurisdiction [Member]    
Tax Credit Carryforward [Line Items]    
Net operating loss carryforward expiration period 2035