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Summary of Activity for Stock Options (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Stock Options Number Outstanding    
Beginning Balance 514,693  
Cancelled or Expired (9,100)  
Ending Balance 505,593 514,693
Vested or expected to vest as of December 31, 2022 505,593  
Exercisable as of December 31, 2022 505,593  
Stock Options Average Exercise Price per share    
Beginning Balance $ 5.11  
Cancelled or Expired 8.47  
Ending Balance 5.05 $ 5.11
Vested or expected to vest as of December 31, 2022 5.05  
Exercisable as of December 31, 2022 $ 5.05  
Stock Options Remaining Contractual Life (in years)    
Weighted Average Remaining Contractual Term (Years) 3 years 2 months 1 day 4 years 1 month 9 days
Vested or expected to vest as of December 31, 2022 3 years 2 months 1 day  
Exercisable as of December 31, 2022 3 years 2 months 1 day  
Stock Options Average Intrinsic Value    
Beginning Balance $ 11,850,930  
Ending Balance 1,280,805 $ 11,850,930
Vested or expected to vest as of December 31, 2022 1,280,805  
Exercisable as of December 31, 2022 $ 1,280,805