Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesFor purposes of interim reporting, our annual effective income tax rate is estimated in accordance with ASC 740-270, "Interim Reporting." This rate is applied to the pre-tax book income of the entities expected to be benefited during the year. Discrete items that impact the tax provision are recorded in the period incurred. For the three and nine months ended September 30, 2020, we recorded a provision for income taxes of $6.5 million and $5.5 million, respectively, resulting in an effective income tax rate of 15.4% and 8.2% for those periods. For the three and nine months ended September 30, 2019, we recorded a provision for income taxes of $2.9 million and $3.4 million, respectively, resulting in an effective income tax rate of 14.0% and 7.8% for those periods. Our effective tax rates were different from the statutory rate primarily due to research and development tax credits claimed, tax windfall benefits from employee stock-based payment transactions and foreign derived intangible income deductions, partially offset by the impact of state taxes and non-deductible meal and entertainment expenses. We recognize a valuation allowance if, based on the weight of available evidence, both positive and negative, it is more likely than not that some portion, or all, of net deferred tax assets will not be realized. Due to the uncertainty of realization of certain deferred tax assets acquired in 2017 related to our Canadian net operating losses and research and development tax credits, we established a valuation allowance of $0.3 million during the second quarter of 2019, which remained at $0.3 million as of September 30, 2020 and December 31, 2019. We apply guidance for uncertainty in income taxes that requires the application of a more likely than not threshold to the recognition and de-recognition of uncertain tax positions. If the recognition threshold is met, this guidance permits us to recognize a tax benefit measured at the largest amount of the tax benefit that, in our judgment, is more likely than not to be realized upon settlement. We recorded an increase to the unrecognized tax benefits of $1.1 million primarily for research and development tax credits claimed during the nine months ended September 30, 2020. We recorded a reduction to the unrecognized tax benefits of $0.2 million for research and development tax credits claimed during the nine months ended September 30, 2019. As of September 30, 2020 and December 31, 2019, we accrued $0.2 million of total interest expense related to unrecognized tax benefits. We recognize interest and penalties related to unrecognized tax benefits as a component of income tax expense.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.