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Common Stock Warrant Activity (Detail) - Warrant [Member]
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Shares  
Beginning Balance | shares 12,538,204
Granted | shares
Exercised | shares (1,180,240)
Forfeited/cancelled | shares
Ending Balance | shares 11,357,964
Weighted Average Exercise Price  
Outstanding, December 31, 2020 | $ / shares $ 4.22
Granted | $ / shares
Exercised | $ / shares 2.50
Forfeited/cancelled | $ / shares
Outstanding, June 30, 2021 | $ / shares $ 4.40