Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Additional Information (Detail)

v3.21.1
Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]                      
Revenue   $ 90,000 $ 61,500 $ 114,375 $ 61,475 $ 45,643 $ 40,500 $ 47,500 $ 66,500 $ 327,350 $ 200,143
Research and development expense, total                   17,066,122 23,228,810
Liability for unrecognized tax benefits   $ 0               0  
Interest or penalties for uncertain tax positions                   $ 0 $ 0
Antidilutive securities excluded from computation of earnings per share, amount                   5,256,942 6,739,639
Employee Stock Purchase Plan [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Common stock purchase price discount percentage 85.00%                 15.00%  
Product Development Projects Revenue [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Revenue                   $ 197,350 $ 193,043
Royalty Revenue [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Revenue                   0 7,100
Contract Services Revenue [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Revenue                   $ 130,000 $ 0