Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock Warrants (Detail)

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Stockholders' Equity - Summary of Stock Warrants (Detail) - $ / shares
9 Months Ended
Jul. 18, 2020
Sep. 30, 2020
Sep. 30, 2019
Equity [Abstract]      
Number of Warrants, beginning balance   3,959,287 3,843,587
Number of warrants, granted   11,200,000 125,000
Number of warrants, exercised 150,000 1,377,700 9,300
Number of Warrants, adjustment   633,472  
Number of Warrants, adjustment   375,000  
Number of Warrants, ending balance   14,790,059 3,959,287
Weighted Average Exercise Price, Outstanding at Ending Balance   $ 5.36 $ 5.44
Weighted Average Exercise Price, granted   0.90 2.64
Weighted Average Exercise Price, exercised   2.24 2.40
Weighted Average Exercise Price, adjustment   0.34  
Weighted Average Exercise Price, adjustment   0.67  
Weighted Average Exercise Price, Outstanding at Ending Balance   $ 1.79 $ 5.36