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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of deferred tax assets and liabilities, net
The components of the Company's net deferred tax assets at December 31 are as follows:
20192018
Deferred Tax Assets
Net operating loss and tax credits$16,964,685 $16,410,403 
Property and equipment and intangibles227,072 236,318 
Allowance for accounts receivable257,564 251,068 
Reserve for expired product469,466 558,484 
Inventory35,227 193,150 
Deferred charges845,765 910,577 
Cumulative compensation costs incurred on deductible equity awards1,047,149 884,049 
Total deferred tax assets19,846,928 19,444,049 
Deferred Tax Liabilities
Intangible assets(1,313,965)(1,974,787)
Net deferred tax assets, before valuation allowance18,532,963 17,469,262 
Less: deferred tax asset valuation allowance(18,511,161)(17,382,052)
Net deferred tax assets$21,802 $87,210 
Schedule of federal and state net operating loss carryforwards
The following table summarizes the amount and year of expiration of the Company's federal and state net operating loss carryforwards as of December 31, 2019:
Years of expirationFederalState
2020$— $13,115 
2021 - 2029— 49,392,824 
203044,153,819 461,280 
2031 - 20397,534,351 9,947,070 
Indefinite Period5,493,258 383,869 
Total federal and state net operating loss carryforwards$57,181,428 $60,198,158 
Schedule of the components of income tax benefit (expense)
Income tax (expense) benefit includes the following components for the years ended December 31:
201920182017
Current:
Federal$65,408 $— $— 
State and other79,316 (16,636)(59,243)
Total current income tax (expense) benefit144,724 (16,636)(59,243)
Deferred:
Federal(65,408)— (3,682,772)
State— — (432,874)
Total deferred income tax (expense) benefit(65,408)— (4,115,646)
Total income tax (expense) benefit $79,316 $(16,636)$(4,174,889)
Schedule of effective tax rate reconciliation
The Company’s effective income tax rate for 2019, 2018 and 2017 reconciles with the federal statutory tax rate as follows: 
201920182017
Federal tax expense at statutory rate21 %21 %34 %
State income tax expense (net of federal income tax benefit)%%%
Permanent differences associated with general business credits%%%
Change in valuation allowance(31)%(25)%(148)%
Change in tax rate— %— %%
Other permanent differences%(1)%%
Other— %— %(2)%
Net income tax expense%— %(108)%