Income Taxes - Additional Information (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2025
Income Taxes [Abstract]
Valuation allowance against deferred tax assets	$ 2,447	$ 2,447
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax assets, provisional income tax benefit		8,000
Transition tax expense		$ 100
Change in effective tax rate due to FDII	4.3
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%	35.00%
Foreign derived intangible income (FDII) effective tax rate		13.1	16.4