Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Cash associated with indefinitely reinvested foreign earnings	$ 4,900
Unrecognized tax benefits related to uncertain tax positions	9,127	$ 9,105	$ 6,844	$ 7,671
Recorded as a decrease in deferred tax assets and offsetting valuation allowance	8,451	7,996	5,382
Unrecognized Tax Benefits Recorded as Other Long Term Liability	676	1,109	1,462
Reversal of tax reserve	543	$ 511	$ 903
Interest and penalty expense recognized related to unrecognized tax benefits	300
Unrecognized tax benefits	700
Tax Reserve Member
Tax Credit Carryforward [Line Items]
Reversal of tax reserve	300
Unrecognized Tax Benefits Reserve Accrued Interest Member
Tax Credit Carryforward [Line Items]
Reversal of tax reserve	200
Research and development and other tax credit carryforwards
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 22,700