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Stock Based Compensation - Summary of Restricted Stock and Restricted Stock Units (Detail) - Restricted Stock and Restricted Stock Units [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock Beginning Balance, Shares 915 1,012 1,190
Granted 480 600 440
Restricted stock vested (377) (555) (393)
Forfeited (26) (142) (225)
Restricted Stock Ending Balance, Shares 992 915 1,012
Restricted stock units vested at December 31, 2020 134    
Restricted Stock Beginning Balance, Weighted Average Grant Date Fair Value $ 3.85 $ 5.72 $ 4.75
Granted, Weighted Average Grant Date Fair Value 1.41 2.36 6.86
Restricted stock vested, Weighted Average Grant Date Fair Value 4.29 5.33 4.76
Forfeited, Weighted Average Grant Date Fair Value 3.66 5.07 4.54
Restricted Stock Ending Balance, Weighted Average Grant Date Fair Value 2.54 $ 3.85 $ 5.72
Restricted stock units vested, Weighted Average Grant Date Fair Value $ 2.56    
Restricted Outstanding, Aggregate Intrinsic Value $ 3,640    
Restricted stock units vested, Aggregate Intrinsic Value $ 490    
Restricted Stock Outstanding, Average Remaining Vesting Period (months) 17 years 1 month 6 days    
Restricted Stock Outstanding, Unrecognized Compensation Expense $ 838