Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.20.1
Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Maturity period of highly liquid investments three months or less      
Realized gains or losses on marketable securities $ 0 $ 0    
Number of securities in unrealized loss position for more than 12 months 0 0    
Grants receivable recognized $ 1,500,000 $ 700,000    
Grants receivable 1,700,000   $ 1,100,000  
Grants remaining to be awarded 6,800,000      
Operating lease right-of use assets 2,987,806   3,043,826  
Operating lease liabilities 3,825,558      
Current portion of lease liabilities 634,932   631,889  
Long-term portion of lease liabilities $ 3,190,626   $ 3,264,128  
Accounting Standards Update 2016-02 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Operating lease right-of use assets       $ 3,300,000
Operating lease liabilities       4,100,000
Current portion of lease liabilities       600,000
Long-term portion of lease liabilities       $ 3,500,000