Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	6. Income Taxes We determine our interim income tax provision by applying our effective income tax rate expected to be applicable for the full fiscal year to pre-tax income (loss) for the interim periods, adjusting the result for any discrete items which occurs during the interim period. On December 22, 2017, U.S. tax legislation was enacted containing a broad range of tax reform provisions. The SEC staff concurrently issued Staff Accounting Bulletin No.118, providing additional guidance on accounting for the financial statement effects of U.S. tax reform and allowing companies to record provisional amounts during a one-year measurement period, not to extend beyond one year from the enactment date. During the three months ended September 30, 2018, we recorded an incremental charge of $0.3 million against our provisional net tax benefit of $1.2 million recorded in December 2017 related to the impact on our deferred tax balances and the additional tax resulting from the mandatory deemed repatriation of foreign earnings. We expect to finalize our remaining provisional estimates, which primarily relate to the state impact of tax reform, during the three months ending December 31, 2018. Further, we are continuing to evaluate the provisions related to global intangible low tax income (GILTI) and expect to make a policy election to account for GILTI as a period expense during the three months ending December 31, 2018. For additional information regarding 2017 U.S. tax reform, see Note 9 of the notes to our consolidated financial statements included in our 2017 Form 10-K. Accounting for Uncertainty in Income Taxes At September 30, 2018 and December 31, 2017, we had unrecognized tax benefits of $0.3 million and $0.5 million, respectively, related to research credits. For the three and nine months ended September 30, 2018 and 2017, we did not recognize any interest or penalties for uncertain tax positions, nor were there any interest or penalties accrued at September 30, 2018 and December 31, 2017. We do not anticipate any significant increases or decreases in our unrecognized tax benefits within the next twelve months. We are subject to U.S. and foreign income tax examinations for years subsequent to 2014, and state income tax examinations for years subsequent to 2012. However, to the extent allowable by law, the tax authorities may have a right to examine prior periods when net operating losses or tax credits were generated and carried forward for subsequent utilization, and make adjustments up to the amount of the net operating losses or credit carryforwards.

Income Taxes

9 Months Ended

Sep. 30, 2018

6. Income Taxes

We determine our interim income tax provision by applying our effective income tax rate expected to be applicable for the full fiscal year to pre-tax income (loss) for the interim periods, adjusting the result for any discrete items which occurs during the interim period.

On December 22, 2017, U.S. tax legislation was enacted containing a broad range of tax reform provisions. The SEC staff concurrently issued Staff Accounting Bulletin No.118, providing additional guidance on accounting for the financial statement effects of U.S. tax reform and allowing companies to record provisional amounts during a one-year measurement period, not to extend beyond one year from the enactment date. During the three months ended September 30, 2018, we recorded an incremental charge of $0.3 million against our provisional net tax benefit of $1.2 million recorded in December 2017 related to the impact on our deferred tax balances and the additional tax resulting from the mandatory deemed repatriation of foreign earnings. We expect to finalize our remaining provisional estimates, which primarily relate to the state impact of tax reform, during the three months ending December 31, 2018. Further, we are continuing to evaluate the provisions related to global intangible low tax income (GILTI) and expect to make a policy election to account for GILTI as a period expense during the three months ending December 31, 2018. For additional information regarding 2017 U.S. tax reform, see Note 9 of the notes to our consolidated financial statements included in our 2017 Form 10-K.

Accounting for Uncertainty in Income Taxes

At September 30, 2018 and December 31, 2017, we had unrecognized tax benefits of $0.3 million and $0.5 million, respectively, related to research credits. For the three and nine months ended September 30, 2018 and 2017, we did not recognize any interest or penalties for uncertain tax positions, nor were there any interest or penalties accrued at September 30, 2018 and December 31, 2017. We do not anticipate any significant increases or decreases in our unrecognized tax benefits within the next twelve months.

We are subject to U.S. and foreign income tax examinations for years subsequent to 2014, and state income tax examinations for years subsequent to 2012. However, to the extent allowable by law, the tax authorities may have a right to examine prior periods when net operating losses or tax credits were generated and carried forward for subsequent utilization, and make adjustments up to the amount of the net operating losses or credit carryforwards.