Income Taxes	3 Months Ended
Mar. 31, 2017
Income Taxes
Income Taxes	13. Income taxes For the three months ended March 31, 2017, we recorded an income tax benefit of approximately $10.9 million compared to income tax expense of approximately $0.4 million for the three months ended March 31, 2016. The change in tax expense or benefit for the three months ended March 31, 2017 and 2016 was primarily driven by the difference in projected annual operating income or loss compared to our actual results for the first quarter as well as the recognition of certain discrete items in the current period. As a result, our year-to-date recorded effective tax rate may differ significantly from our full year effective tax rate. As of March 31, 2017, a full valuation allowance continues to be recorded against our U.S. and Swiss net deferred tax assets, based on an analysis of positive and negative evidence, including analyzing three-year cumulative pre-tax income or loss, projections of future taxable income as well as other quantitative and qualitative information. Our liability for unrecognized tax benefits (including penalties and interest) increased by approximately $0.7 million during the three months ended March 31, 2017, of which only $0.1 million was recorded as an increase to noncurrent other liabilities on the condensed consolidated balance sheet. The increase is primarily driven by unrecognized tax benefits related to current year operations.

Income Taxes

3 Months Ended

Mar. 31, 2017

13. Income taxes

For the three months ended March 31, 2017, we recorded an income tax benefit of approximately $10.9 million compared to income tax expense of approximately $0.4 million for the three months ended March 31, 2016. The change in tax expense or benefit for the three months ended March 31, 2017 and 2016 was primarily driven by the difference in projected annual operating income or loss compared to our actual results for the first quarter as well as the recognition of certain discrete items in the current period. As a result, our year-to-date recorded effective tax rate may differ significantly from our full year effective tax rate.

As of March 31, 2017, a full valuation allowance continues to be recorded against our U.S. and Swiss net deferred tax assets, based on an analysis of positive and negative evidence, including analyzing three-year cumulative pre-tax income or loss, projections of future taxable income as well as other quantitative and qualitative information.

Our liability for unrecognized tax benefits (including penalties and interest) increased by approximately $0.7 million during the three months ended March 31, 2017, of which only $0.1 million was recorded as an increase to noncurrent other liabilities on the condensed consolidated balance sheet. The increase is primarily driven by unrecognized tax benefits related to current year operations.