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Income Taxes - Difference Between Total Income Taxes Expense and Amount Computed at Statutory Federal Income Tax Rate (Detail) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Book loss before income taxes of the TRS $ (4,838) $ (8,167) $ (6,040)
Statutory rate applied to pre-tax income (1,016) (1,715) (1,268)
Effect of state and local income taxes, net of federal tax benefit (253) (347) (200)
Permanent adjustments 4 8 12
Change in valuation allowance 1,445 2,100 1,456
Valuation allowance release 0 0 (28)
Other (180) (46) 0
Total income tax expense (benefit) $ 0 $ 0 $ (28)
Effective tax rate 0.00% 0.00% 0.46%