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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Apr. 30, 2018
Dec. 31, 2015
USD ($)
Nov. 30, 2015
USD ($)
shares
Sep. 30, 2015
ft²
Dec. 31, 2019
USD ($)
Milestone
Dec. 31, 2018
USD ($)
Milestone
Other Commitments [Line Items]              
Rental expense           $ 188,000 $ 170,000
Remaining term of office lease           1 year 9 months  
Debt outstanding           $ 0  
Number of milestones achieved | Milestone           0 0
Indemnification obligations amount           $ 0  
Contingent liabilities           $ 0 $ 0
Research and Development Expenses [Member]              
Other Commitments [Line Items]              
Milestone payment $ 300,000            
License Agreement [Member]              
Other Commitments [Line Items]              
Sales based milestone payment     $ 36,000,000        
Royalty payment period     8 years        
License Agreement [Member] | Maximum [Member]              
Other Commitments [Line Items]              
Development and regulatory milestone payments     $ 42,100,000        
License Agreement [Member] | Minimum [Member]              
Other Commitments [Line Items]              
Sales required to achieve milestone payment     1,000,000,000        
Office of Chief Scientist of Israeli Ministry of Economy and Industry [Member]              
Other Commitments [Line Items]              
Grants received     $ 537,000        
Scientific Development and Research, Inc. and Otodyne, Inc. [Member] | License Agreement [Member]              
Other Commitments [Line Items]              
License fees paid       $ 750,000      
Share issued as consideration | shares       9,780      
Three-year Operating Lease [Member]              
Other Commitments [Line Items]              
Operating lease expiration term         3 years    
Area of office space | ft²         5,197    
Leases expiration date         Aug. 31, 2018    
Leases extension date   Sep. 30, 2021