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Stockholders' Equity - Schedule of Warrant Activity (Detail)
 12 Months Ended
Dec. 31, 2019
shares
Class Of Warrant Or Right [Line Items]  
Balance as of January 1, 2019 0
Warrants issued 7,070,680
Warrants exercised 0
Warrants expired 0
Balance as of December 31, 2019 7,070,680
Registered Direct Warrants, Series A [Member]  
Class Of Warrant Or Right [Line Items]  
Balance as of January 1, 2019 0
Warrants issued 3,449,112
Warrants exercised 0
Warrants expired 0
Balance as of December 31, 2019 3,449,112
Registered Direct Warrants, Series B [Member]  
Class Of Warrant Or Right [Line Items]  
Balance as of January 1, 2019 0
Warrants issued 3,449,112
Warrants exercised 0
Warrants expired 0
Balance as of December 31, 2019 3,449,112
Registered Direct Warrants, Placement Agent [Member]  
Class Of Warrant Or Right [Line Items]  
Balance as of January 1, 2019 0
Warrants issued 172,456
Warrants exercised 0
Warrants expired 0
Balance as of December 31, 2019 172,456