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Income Taxes (Details 2)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
The reconciliations of the U.S. federal statutory rate to the effective income tax rate      
Tax provision at U.S. federal statutory rates 21.00% 21.00% 21.00%
State income taxes net of federal benefit 2.10% 3.00% 3.20%
Deferred tax asset adjustments - NOL related 0.00% (0.40%) (0.20%)
Non-deductible permanent items (1.10%) (0.30%) (0.20%)
Stock options (28.00%) (3.20%) (3.40%)
Goodwill impairment 0.00% 0.00% (1.50%)
Other 0.00% (3.90%) (0.20%)
Change in valuation allowance 5.80% (16.30%) (18.70%)
Effective income tax rate (0.20%) (0.10%) 0.00%