Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 0	$ 1,256
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)	20,000
Unrecognized tax benefits that would impact tax expense		10,000
Uncertain tax positions, interest and penalties	300	500	$ 500
Interest and penalties accrued	$ 1,400	1,400	$ 1,100
Internal Revenue Service (IRS)
Tax Credit Carryforward [Line Items]
Net operating loss		3,800
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Net operating loss		3,000
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Net operating loss		65,200
Research Tax Credit Carryforward | Internal Revenue Service (IRS)
Tax Credit Carryforward [Line Items]
Tax credit carryforward amount		3,100
Research Tax Credit Carryforward | State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforward amount		$ 13,400