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Commitments - Additional Information (Detail)
 1 Months Ended
Jun. 06, 2018
Jul. 31, 2018
USD ($)
Jul. 25, 2017
USD ($)
a
Jun. 25, 2017
USD ($)
a
Jun. 09, 2017
USD ($)
ft²
Jun. 05, 2017
USD ($)
a
Commitments And Contingencies [Line Items]            
Operating Leases, Rent Expense, Minimum Rentals   $ 53,000        
Fifth Amendment [Member]            
Commitments And Contingencies [Line Items]            
Area of Land | a           21,908
East Brunswick [Member] | Commitments [Member]            
Commitments And Contingencies [Line Items]            
Lease Expiration Date       Sep. 30, 2022    
Area of Land | a       15,000    
Operating Leases, Rent Expense       $ 8,542    
Milford [Member] | Commitments [Member]            
Commitments And Contingencies [Line Items]            
Lease Expiration Date     Aug. 31, 2019      
Area of Land | a     13,750      
Operating Leases, Rent Expense     $ 8,707      
San Diego, California [Member]            
Commitments And Contingencies [Line Items]            
Lease Expiration Date           Jul. 31, 2022
Operating Leases, Rent Expense           $ 22,721
New York [Member] | Commitments [Member]            
Commitments And Contingencies [Line Items]            
Lease Expiration Date Jun. 30, 2021       Jun. 30, 2018  
Area of Land | ft²         12,000  
Operating Leases, Rent Expense         $ 13,000