Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	7. 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 for the interim periods, adjusting the result for any discrete items which occur during the interim period. Accounting for Uncertainty in Income Taxes At each of March 31, 2019 and December 31, 2018, we had unrecognized tax benefits of $0.3 million related to research credits. For the three months ended March 31, 2019 and 2018, we did not recognize any interest or penalties for uncertain tax positions, nor were there any interest or penalties accrued at March 31, 2019 and December 31, 2018. 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 2013. 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

3 Months Ended

Mar. 31, 2019

7. 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 for the interim periods, adjusting the result for any discrete items which occur during the interim period.

Accounting for Uncertainty in Income Taxes

At each of March 31, 2019 and December 31, 2018, we had unrecognized tax benefits of $0.3 million related to research credits. For the three months ended March 31, 2019 and 2018, we did not recognize any interest or penalties for uncertain tax positions, nor were there any interest or penalties accrued at March 31, 2019 and December 31, 2018. 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 2013. 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.