Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Percent of pre-tax income:    
U.S. federal statutory income tax rate 34.00% 34.00%
State taxes, net of federal benefit 0.00% 0.10%
Permanent items (5.30%) (3.10%)
Research and development credit 3.00% 0.90%
Change in valuation allowance (31.70%) (31.90%)
Effective income tax rate 0.00% 0.00%