Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 3)

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Income Taxes (Details 3)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of difference between the federal statutory tax rate and the effective tax rate      
Federal statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 2.80% 2.50% 2.40%
Foreign income tax (7.80%) (10.30%) (7.90%)
Research and development tax credits (0.00%) 1.10% 1.00%
Non-Deductible components of Convertible Debt (9.40%) (3.80%) (16.70%)
Valuation allowance 61.10% (25.30%) (11.40%)
Other (1.70%) 0.80% (3.90%)
Total 80.00% 0.00% (1.50%)