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
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]    
Number of Warrants, beginning balance 2,718,012 791,857
Number of warrants, granted   2,240,000
Number of warrants, exercised (2,326,112) (275,540)
Number of warrants, adjustment   126,694
Number of warrants, adjustment   75,000
Number of Warrants, ending balance 391,900 2,958,011
Weighted Average Exercise Price, Outstanding at Beginning Balance $ 4.20 $ 21.25
Weighted Average Exercise Price, granted   4.50
Weighted Average Exercise Price, exercised 4.08 3.48
Weighted Average Exercise Price, adjustment   1.70
Weighted Average Exercise Price, adjustment   3.36
Weighted Average Exercise Price, Outstanding at Ending Balance $ 4.35 $ 8.93