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Income Taxes - Schedule of effective income tax rate reconciliation (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Federal statutory tax rate | 21.00% | 21.00%
State taxes | (4.50%) | 4.40%
Non deductible expenses | (0.30%) | (0.60%)
Tax credits | 4.00% | 4.60%
Expired tax credit | (1.30%) | (3.90%)
Deferred tax adjustment | (4.80%) | 0.00%
Stock based compensation | 1.90% | 0.80%
Valuation allowance | 3.20% | (167.00%)
Contingent purchase revaluation | 0.00% | (1.00%)
Other | (0.30%) | (0.10%)
Total | 18.90% | (141.80%)

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