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Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Unit Awards (Detail)
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Management Incentive Plan [Member] | TSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Units, Beginning Balance | shares 291,370
Granted, Number of Units | shares 43,250 [1]
Forfeited, Number of Units | shares (92,912)
Vested, Number of Units | shares (76,153)
Outstanding, Number of Units, Ending Balance | shares 165,555
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 5.18 [2]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 3.10 [1],[2]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 5.12 [2]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 5.12 [2]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 4.70 [2]
2017 Non-Employee Directors Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Units, Beginning Balance | shares 16,157
Granted, Number of Units | shares 0
Forfeited, Number of Units | shares 0
Vested, Number of Units | shares (7,259)
Outstanding, Number of Units, Ending Balance | shares 8,898
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 5.12
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 5.12
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 5.12
[1]

The aggregate grant date fair value of TSUs issued for the nine months ended September 30, 2020 was $0.1 million based on a grant date market price of ranging from $0.54 to $6.61 per share.

[2]

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