Quarterly report pursuant to Section 13 or 15(d)

Commitments - Additional Information (Detail)

v3.19.3
Commitments - Additional Information (Detail) - USD ($)
1 Months Ended
May 31, 2015
Sep. 30, 2019
Jul. 31, 2010
Operating Leased Assets [Line Items]      
Incremental borrowing rate   12.00%  
Amount payable upon the achievement of specified regulatory milestone     $ 18,000,000
Operating lease term July 2014 through December 2019 [Member]      
Operating Leased Assets [Line Items]      
Lease renewal term   5 years  
Operating lease term September 2015 through September 2020 [Member]      
Operating Leased Assets [Line Items]      
Percentage of base rent escalator 3.00%    
Rent expense $ 33,000    
Lease agreement rent expense for future period $ 39,000