v3.26.1
Stockholders' Equity (Deficit) - Summary of Stock Option Activity (Detail) - 2014 EIP and Inducement Plan - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Shares, beginning balance 72,290  
Forfeited or expired, Shares (942)  
Outstanding, Shares, ending balance 71,348 72,290
Vested and expected to vest, Shares 71,348  
Exercisable, Shares 71,348  
Outstanding, Weighted Average Exercise Price, beginning balance $ 191.81  
Forfeited or expired, Weighted Average Exercise price 400.43  
Outstanding, Weighted Average Exercise Price, ending balance 189.04 $ 191.81
Exercisable, Weighted Average Exercise Price 189.04  
Stock options vested and expected to vest, Weighted Average Exercise Price $ 189.04  
Outstanding, Weighted Average Remaining Contractual Term 5 years 1 month 6 days 6 years 2 months 12 days
Stock options vested and expected to vest, Weighted Average Remaining Contractual Term 5 years 1 month 6 days  
Exercisable, Weighted Average Remaining Contractual Term 5 years 1 month 6 days  
Aggregate intrinsic value $ 2 $ 23
Vested and expected to vest, Aggregate Intrinsic Value 2  
Exercisable, Aggregate Intrinsic Value $ 2