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Quarterly Financial Data - Unaudited - Quarterly Financial Data (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]                      
Revenue-net $ 804,212 $ 886,327 $ 1,073,479 $ 511,735   $ 11,854 $ 587,270 $ 649,353 $ 3,275,753 $ 1,248,477 $ 4,683,035
Gross profit 804,212 886,327 1,073,479 511,735   11,854 587,270 649,353      
Net income (loss) $ (1,476,842) $ (1,309,275) $ (641,557) $ (1,744,762) $ (1,392,227) $ (2,251,097) $ (1,916,885) $ (2,199,263) $ (9,104,285) $ (11,021,142) $ (9,078,075)
Basic and diluted net income per share $ (0.16) $ (0.15) $ (0.08) $ (0.21) $ (0.17) $ (0.27) $ (0.23) $ (0.28) $ (0.60) $ (0.95) $ (0.84)