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Leases - Schedule of Future Payment on Sale-leaseback Financing Liability (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Leases [Abstract]  
2018 $ 406
2019 414
2020 422
2021 431
2022 439
Thereafter 4,106
Total payments 6,218
Less amount representing interest (1,635)
Total sale-leaseback financing liability 4,583
Less current portion of sale-leaseback financing liability included in accounts payable and accrued expenses (202)
Long-term portion of sale-leaseback financing liability included in other liabilities $ 4,381