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Income Taxes (Schedule of Deferred Tax Assets and Liabilities, Net) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets    
Net operating loss and tax credits $ 16,961,650 $ 16,964,685
Property and equipment and intangibles 227,056 227,072
Allowance for accounts receivable 249,483 257,564
Reserve for expired product 438,235 469,466
Inventory 100,362 35,227
Deferred charges 952,711 845,765
Cumulative compensation costs incurred on deductible equity awards 928,638 1,047,149
Total deferred tax assets 19,858,135 19,846,928
Deferred Tax Liabilities    
Intangible assets (662,014) (1,313,965)
Net deferred tax assets, before valuation allowance 19,196,121 18,532,963
Less: deferred tax asset valuation allowance (19,196,121) (18,511,161)
Net deferred tax assets $ 0 $ 21,802