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INCOME TAXES - Income Tax Expense (Benefit) (Details) - USD ($)
12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax benefit at statutory rate   $ (5,074,100) $ (3,946,000)
State income taxes, net of federal tax benefit   (477,200) (157,700)
Non-deductible expenses   333,600 342,400
Credits   (224,900) 0
Change in federal tax rate   0 2,234,800
Change in state tax rate   (82,300) 83,200
Other   603,900 (101,000)
Change in valuation allowance   4,921,000 1,544,300
Income tax benefit   $ 0 $ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax benefit at statutory rate (21.00%) (21.00%) (34.00%)
State income taxes, net of federal tax benefit   (2.00%) (1.40%)
Non-deductible expenses   1.40% 3.00%
Credits   (0.90%) 0.00%
Change in federal tax rate   (0.00%) 19.30%
Change in state tax rate   (0.30%) 0.70%
Other   2.50% (0.90%)
Change in valuation allowance   20.30% 13.30%
Income tax benefit   (0.00%) (0.00%)