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Stock Benefit Plans and Stock-Based Compensation - Summary of Information about Restricted Stock Awards, Restricted Stock Units and Performance-Based Restricted Units Activity (Detail) - Restricted Stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, Unvested beginning balance 3,270  
Shares, Awarded 4,802  
Shares, Vested (1,224)  
Shares, Forfeited (121)  
Shares, Unvested ending balance 6,727 3,270
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted average grant date fair value, Unvested beginning balance $ 2.94  
Weighted average grant date fair value, Awarded 1.92 $ 2.87
Weighted average grant date fair value, Vested 2.83  
Weighted average grant date fair value, Forfeited 3.11  
Weighted average grant date fair value, Unvested ending balance $ 2.17 $ 2.94
Weighted average remaining recognition period (in years) 2 years 3 months 25 days