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Preferred Stock and Stockholders' Equity - Schedule of Warrants to Purchase Common Stock Activity (Detail) - Common Stock Warrants [Member]
 6 Months Ended
Jun. 30, 2025
shares
Class Of Warrant Or Right [Line Items]  
Beginning Balance 33,052,744
Issued 0
Exercised 0
Cancelled/Expired 0
Ending Balance 33,052,744
Common Warrants [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 15,778,451
Issued 0
Exercised 0
Cancelled/Expired 0
Ending Balance 15,778,451
Pre-Funded Warrants [Member]  
Class Of Warrant Or Right [Line Items]  
Beginning Balance 17,274,293
Issued 0
Exercised 0
Cancelled/Expired 0
Ending Balance 17,274,293