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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, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, Unvested beginning balance 2,000  
Shares, Awarded 1,924  
Shares, Vested (278)  
Shares, Forfeited (376)  
Shares, Unvested ending balance 3,270 2,000
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 $ 3.41  
Weighted average grant date fair value, Awarded 2.87 $ 2.96
Weighted average grant date fair value, Vested 4.00  
Weighted average grant date fair value, Forfeited 4.31  
Weighted average grant date fair value, Unvested ending balance $ 2.94 $ 3.41
Weighted average remaining recognition period (in years) 2 years 6 months 18 days 2 years 9 months 10 days