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Summary of Activity for Stock Option Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Stock Options Number Outstanding    
Beginning Balance 562,102  
Ending Balance 562,102 562,102
Vested or expected to vest as of March 31, 2020 562,102  
Exercisable as of March 31, 2020 562,102  
Stock Options Average Exercise Price per share    
Beginning Balance $ 5.60  
Ending Balance 5.60 $ 5.60
Vested or expected to vest as of March 31, 2020 5.60  
Exercisable as of March 31, 2020 $ 5.60  
Stock Options Remaining Contractual Life (in years)    
Weighted Average Remaining Contractual Term (Years) 5 years 6 months 21 days 5 years 10 months 9 days
Vested or expected to vest as of March 31, 2020 5 years 6 months 21 days  
Exercisable as of March 31, 2020 5 years 6 months 21 days  
Stock Options Average Intrinsic Value    
Average intrinsic value   $ 572,869