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Quarterly Financial Data - Unaudited (Detail) - USD ($)
3 Months Ended 12 Months Ended
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
Dec. 31, 2018
Selected Quarterly Financial Information [Abstract]                      
Revenue - net $ 301,314 $ 211,538 $ 519,969 $ 1,005,511 $ 741,449 $ 762,175 $ 774,436 $ 794,927 $ 2,038,332 $ 3,072,987 $ 3,275,753
Gross profit 301,314 211,538 519,969 1,005,511 741,449 762,175 774,436 794,927      
Net income (loss) $ (2,367,511) $ (5,448,046) $ (4,098,623) $ (2,897,976) $ (2,267,960) $ (4,229,833) $ (2,774,282) $ (1,167,886) $ (14,812,156) $ (10,439,961) $ (5,172,436)
Basic and diluted net income per share $ (0.17) $ (0.51) $ (0.43) $ (0.30) $ (0.24) $ (0.45) $ (0.30) $ (0.13) $ (1.41) $ (1.12) $ (0.60)