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Registered Offering and Warrants - Schedule of Pre-funded Warrants and Warrants Outstanding (Detail)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Beginning Balance  
Warrant issued 30,750,000
Warrant exercised (11,750,000)
Ending Balance 19,000,000
Pre funded Warrants [Member]  
Class Of Warrant Or Right [Line Items]  
Warrant description Pre-Funded Warrants
Warrant classification Liability
Warrant exercise price | $ / shares $ 0.0001
Warrant expiration date Mar. 17, 2025
Warrant issued 11,750,000
Warrant exercised (11,750,000)
Warrants [Member]  
Class Of Warrant Or Right [Line Items]  
Warrant description Warrants
Warrant classification Liability
Warrant exercise price | $ / shares $ 5.95
Warrant expiration date Mar. 17, 2025
Beginning Balance  
Warrant issued 19,000,000
Ending Balance 19,000,000