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Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Federal net operating loss carryforward | $ 11,202 | $ 10,876
Federal Sec. 382 net operating loss carryforward | 3,642 | 0
Accrued interest to related parties, not deductible until paid | 259 | 334
Stock options | 614 | 0
Accrued compensation | 39 | 0
Basis of intangible assets | 332 | 221
Basis in foreign entity | 509 | 0
Valuation allowance | (9,438) | (3,950)
Total deferred tax assets | 7,159 | 7,481
Basis of property, plant and equipment | 6,969 | 7,447
Bad debt expense | 39 | 34
Prepaid expenses | 151 | 0
Total deferred tax liabilities | 7,159 | 7,481
Net deferred tax liabilities | $ 0 | $ 0

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