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Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Federal net operating loss carryforward $ 12,203 $ 11,468
Accrued interest to related parties, not deductible until paid 570 449
Accrued compensation 69 101
Basis of intangible assets 309 368
Valuation allowance (6,639) (5,256)
Total deferred tax assets 6,512 7,130
Basis of property, plant and equipment 6,000 6,821
Bad debt expense 0 0
Prepaid expenses 155 138
Basis in foreign entity 357 171
Total deferred tax liabilities 6,512 7,130
Net deferred tax liabilities $ 0 $ 0