Income Tax Expense (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of beginning and ending amount of our unrecognized tax benefits is as follows:

	Six months ended June 30, 2018
	(in thousands)
Unrecognized tax benefits as of December 31, 2017		525
Additions for tax positions of current year		48
Additions for tax positions of prior years		5
Reductions for settlements with taxing authorities		—
Reductions for lapses of the applicable statutes of limitations		—
Unrecognized tax benefits as of June 30, 2018		578

Summary of Tax Years Subject to Examination in Taxing Jurisdictions

As of June 30, 2018, a summary of the tax years that remain subject to examination in our taxing jurisdictions is as follows:

United States	2014 and forward
Foreign	2011 and forward