Income Taxes	6 Months Ended
Jun. 30, 2017
Income Taxes
Income Taxes	13. Income taxes For the three and six months ended June 30, 2017, we recorded income tax expense of approximately $3.1 million and an income tax benefit of $7.8 million, respectively, compared to income tax expense of approximately $0.8 million and $1.2 million for the three and six months ended June 30, 2016. The change in tax expense or benefit for the three and six months ended June 30, 2017 and 2016 was primarily driven by the difference in projected annual operating income or loss compared to our actual results 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 June 30, 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 $1.6 million during the six months ended June 30, 2017, of which only $0.4 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

6 Months Ended

Jun. 30, 2017

13. Income taxes

For the three and six months ended June 30, 2017, we recorded income tax expense of approximately $3.1 million and an income tax benefit of $7.8 million, respectively, compared to income tax expense of approximately $0.8 million and $1.2 million for the three and six months ended June 30, 2016. The change in tax expense or benefit for the three and six months ended June 30, 2017 and 2016 was primarily driven by the difference in projected annual operating income or loss compared to our actual results 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 June 30, 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 $1.6 million during the six months ended June 30, 2017, of which only $0.4 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.