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Stock Award Plans - Summary of Stock Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Outstanding at January 1, 2020 14,135,681  
Granted 196,400  
Exercised (432,166)  
Forfeited (1,451,403)  
Expired (183,896)  
Outstanding at December 31, 2020 12,264,616 14,135,681
Exercisable at December 31, 2020 7,493,851  
Weighted Average Exercise Price per Share    
Outstanding at January 1, 2020 $ 3.09  
Granted 1.30  
Exercised 1.40  
Forfeited 1.55  
Expired 9.86  
Outstanding at December 31, 2020 3.41 $ 3.09
Exercisable at December 31, 2020 $ 4.56  
Weighted Average Remaining Contractual Term (Years)    
Outstanding 6 years 5 months 12 days 7 years 10 months 2 days
Exercisable at December 31, 2020 5 years 7 months 13 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding $ 15,414 $ 182
Exercisable at December 31, 2020 $ 8,079