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Income Taxes - Schedule of effective income tax rate reconciliation (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Computation of Effective Income Tax Rate [Abstract] |  |
Federal statutory tax rate | 21.00% | 34.00%
State taxes | 4.40% | (0.90%)
Non deductible expenses | (0.60%) | 19.40%
Tax credits | 4.60% | (90.60%)
Expired tax credits | (3.90%) | 0.00%
Stock based compensation | 0.80% | (69.60%)
Foreign income tax rate differential | 0.00% | (14.00%)
Repatriation Tax | 0.00% | 110.50%
Impact of Tax Cuts and Jobs Act enactment | 0.00% | 1241.00%
Valuation allowance | (167.00%) | 0.00%
Tax return and audit adjustments | 0.00% | (107.30%)
Contingent purchase revaluation | (1.00%) | (88.00%)
Other | (0.10%) | (1.70%)
Total | (141.80%) | 1032.80%

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