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Organization and Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]                      
Net loss $ 76,619 $ (4,085,297) $ (2,227,499) $ (3,720,218) $ (2,367,511) $ (5,448,046) $ (4,098,623) $ (2,897,976) $ (9,956,395) $ (14,812,156) $ (10,439,961)
Numerator, basic and diluted net loss available to stockholders                 $ (9,656,395) $ (14,812,156) $ (10,439,961)
Shares used in computation – basic:                      
Weighted average common shares outstanding                 13,296,687 10,538,114 9,346,213
Shares used in computation – diluted:                      
Weighted average common shares outstanding                 13,296,687 10,538,114 9,346,213
Net loss per share - basic and diluted $ 0.02 $ (0.31) $ (0.17) $ (0.29) $ (0.17) $ (0.51) $ (0.43) $ (0.30) $ (0.75) $ (1.41) $ (1.12)