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Quarterly Financial Data - Unaudited - Quarterly Financial Data (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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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)

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