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Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Awards (Detail) - PSUs [Member] - Restricted Stock Units (RSUs) [Member]
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Units, Beginning Balance | shares 214,554
Granted, Number of Units | shares 0
Forfeited, Number of Units | shares (3,732)
Vested, Number of Units | shares 0
Outstanding, Number of Units, Ending Balance | shares 210,822
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 2.36 [1]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [1]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 2.11 [1]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [1]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 2.36 [1]
[1]

Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.