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Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
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