Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Warrants Classified as Equity That Are Measured at Fair Value on Nonrecurring Basis (Detail)

v3.21.2
Fair Value Measurement - Summary of Warrants Classified as Equity That Are Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Equity:    
Warrants $ 970 $ 970
Level 1 [Member]    
Equity:    
Warrants 0 0
Level 2 [Member]    
Equity:    
Warrants 0 0
Level 3 [Member]    
Equity:    
Warrants $ 970 $ 970