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Income Taxes (Details 1)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Federal statutory rate 34.00% 34.00% 34.00%
State income taxes, net of federal benefit (22.00%) 1.10% 1.10%
Permanent differences 1.30% (2.70%) 0.60%
Stock based compensation 3.90% 0.00% 0.00%
Federal R&D Credits (29.40%) (1.60%) (1.30%)
Effective tax rate (12.20%) 30.80% 34.40%