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Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Federal net operating loss carryforward | $ 10,876 | $ 9,075
Accrued interest to related parties, not deductible until paid | 335 | 60
Accrued expenses |  | 19
Basis of intangible assets | 221 | 266
Valuation allowance | (3,950) | (1,639)
Total deferred tax assets | 7,481 | 7,781
Basis of property, plant and equipment | 7,447 | 7,741
Prepaid expenses | 34 | 40
Total deferred tax liabilities | 7,481 | 7,781
Net deferred taxes | $ 0 | $ 0

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