Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	(5) Income Taxes The Company’s effective income tax rate differs from the U.S. statutory rate principally due to state taxes, Federal research and development tax credits, jurisdictions with pretax losses for which no tax benefit can be recognized, changes in the valuation allowance and the effects of share based compensation which are recorded discretely in the quarters in which they occur. For the three-month periods ended June 30, 2018 and 2017, the Company recorded a provision of $8.4 million and $5.5 million for income taxes, respectively. The effective income tax rates for the Company for the three-month periods ended June 30, 2018 and 2017 were 15.3% and (200.8%), respectively. The variance in the effective tax rates for the three-month period ended June 30, 2018 as compared to the three-month period ended June 30, 2017 was due primarily to differences in pre-tax book income between the periods, the decrease in the federal statutory tax rate as a result of tax reform, the valuation allowance recorded on deferred tax assets for which no tax benefit can be recognized, state taxes, and the reduction in the research & development tax credit. For the six-month periods ended June 30, 2018 and 2017, the Company recorded a provision of $11.8 million and $4.6 million for income taxes, respectively. The effective income tax rates for the Company for the six-month periods ended June 30, 2018 and 2017 were 23.9% and (20.2%), respectively. The variance in the effective tax rates for the six-month period ended June 30, 2018 as compared to the six-month period ended June 30, 2017 was due primarily to differences in pre-tax book income between the periods, the decrease in the federal statutory tax rate as a result of tax reform, the valuation allowance recorded on deferred tax assets for which no tax benefit can be recognized, state taxes, and the reduction in the research & development tax credit. The Company continues to evaluate the realizability of its deferred tax assets and liabilities on a quarterly basis and will adjust such amounts in light of changing facts and circumstances including, but not limited to, future projections of taxable income, tax legislation, rulings by relevant tax authorities, the progress of ongoing tax audits and the regulatory approval of products currently under development. Any changes to the valuation allowance or deferred tax assets and liabilities in the future would impact the Company's income taxes. The Tax Cuts and Jobs Act of 2017 (the “Act”) was enacted on December 22, 2017. The Act reduces the U.S. federal corporate tax rate from 35% to 21% effective for tax years beginning after December 31, 2017, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously deferred and includes a variety of other changes. On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. For the three and six- month periods ended June 30, 2018, the Company has not completed its accounting for the tax effects of the enactment of the Act; however, in certain cases, we have made a reasonable estimate of the effects on our existing deferred tax balances. In other cases, we have not been able to make a reasonable estimate and continue to account for those items based on our existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately prior to the enactment. The Company has not obtained additional information affecting the provisional amounts initially recorded. The Company did not record a provision related to the one-time transition tax on mandatory repatriation of undistributed foreign earnings and profits per the Act, since a preliminary analysis has determined that there is no accumulated earnings and profits. Additional work is still necessary for a more detailed analysis of the Company's deferred tax assets and liabilities and its historical foreign earnings as well as potential correlative adjustments. Any subsequent adjustment to these amounts will be recorded to current tax expense in the quarter of 2018 when the analysis is complete. The Internal Revenue Service completed its examination of the Company’s US income tax return for 2015 in the second quarter of 2018 with no material impact.

(5) Income Taxes

The Company’s effective income tax rate differs from the U.S. statutory rate principally due to state taxes, Federal research and development tax credits, jurisdictions with pretax losses for which no tax benefit can be recognized, changes in the valuation allowance and the effects of share based compensation which are recorded discretely in the quarters in which they occur.

For the three-month periods ended June 30, 2018 and 2017, the Company recorded a provision of $8.4 million and $5.5 million for income taxes, respectively. The effective income tax rates for the Company for the three-month periods ended June 30, 2018 and 2017 were 15.3% and (200.8%), respectively. The variance in the effective tax rates for the three-month period ended June 30, 2018 as compared to the three-month period ended June 30, 2017 was due primarily to differences in pre-tax book income between the periods, the decrease in the federal statutory tax rate as a result of tax reform, the valuation allowance recorded on deferred tax assets for which no tax benefit can be recognized, state taxes, and the reduction in the research & development tax credit.

For the six-month periods ended June 30, 2018 and 2017, the Company recorded a provision of $11.8 million and $4.6 million for income taxes, respectively. The effective income tax rates for the Company for the six-month periods ended June 30, 2018 and 2017 were 23.9% and (20.2%), respectively. The variance in the effective tax rates for the six-month period ended June 30, 2018 as compared to the six-month period ended June 30, 2017 was due primarily to differences in pre-tax book income between the periods, the decrease in the federal statutory tax rate as a result of tax reform, the valuation allowance recorded on deferred tax assets for which no tax benefit can be recognized, state taxes, and the reduction in the research & development tax credit.

The Company continues to evaluate the realizability of its deferred tax assets and liabilities on a quarterly basis and will adjust such amounts in light of changing facts and circumstances including, but not limited to, future projections of taxable income, tax legislation, rulings by relevant tax authorities, the progress of ongoing tax audits and the regulatory approval of products currently under development. Any changes to the valuation allowance or deferred tax assets and liabilities in the future would impact the Company's income taxes.

The Tax Cuts and Jobs Act of 2017 (the “Act”) was enacted on December 22, 2017. The Act reduces the U.S. federal corporate tax rate from 35% to 21% effective for tax years beginning after December 31, 2017, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously deferred and includes a variety of other changes.

On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Act. For the three and six- month periods ended June 30, 2018, the Company has not completed its accounting for the tax effects of the enactment of the Act; however, in certain cases, we have made a reasonable estimate of the effects on our existing deferred tax balances. In other cases, we have not been able to make a reasonable estimate and continue to account for those items based on our existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately prior to the enactment. The Company has not obtained additional information affecting the provisional amounts initially recorded. The Company did not record a provision related to the one-time transition tax on mandatory repatriation of undistributed foreign earnings and profits per the Act, since a preliminary analysis has determined that there is no accumulated earnings and profits.

Additional work is still necessary for a more detailed analysis of the Company's deferred tax assets and liabilities and its historical foreign earnings as well as potential correlative adjustments. Any subsequent adjustment to these amounts will be recorded to current tax expense in the quarter of 2018 when the analysis is complete.

The Internal Revenue Service completed its examination of the Company’s US income tax return for 2015 in the second quarter of 2018 with no material impact.