Annual report pursuant to Section 13 and 15(d)

Liquidity and Management Plans - Additional Information (Detail)

v3.20.1
Liquidity and Management Plans - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Liquidity And Management Plans [Line Items]                      
Engineering product development   $ 45,643 $ 40,500 $ 47,500 $ 66,500 $ 56,050 $ 228,000 $ 205,773 $ 25,000 $ 200,143 $ 514,823
Net loss   (9,391,398) $ (8,184,227) $ (9,803,996) $ (11,019,468) (12,453,003) $ (12,645,291) $ (12,298,371) $ (13,443,457) (38,399,089) (50,840,122)
Net cash provided by (used in) operating activities                   (26,621,145) (32,527,023)
Proceeds of securities offerings $ 23,319,156 4,557,693               23,319,156 38,846,815
Cash and cash equivalents, at carrying value, total   $ 21,684,089       $ 20,106,485       21,684,089 $ 20,106,485
Technology Service [Member]                      
Liquidity And Management Plans [Line Items]                      
Engineering product development                   $ 200,143