Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 28, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes Disclosure [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent				21.00%	34.00%
Deferred tax balance recorded		$ 1,700,000		$ 1,700,000	$ 1,704,000
Foreign tax effects measurement period adjustments on deferred tax assets and liabilities				0
Provision for income taxes					0
Transition tax liability	$ 0		$ 0	0
Foreign tax effects measurement period adjustments			0	0
Deferred tax asset valuation allowance	5,590,000	2,505,000		5,590,000	2,505,000	$ 2,650,000	$ 2,349,000
Change in deferred tax asset valuation allowance				3,100,000
Penalties and interest accrued	0			0
Net income taxes paid				2,100,000	1,600,000	2,100,000
Income Tax Expense [Member]
Income Taxes Disclosure [Line Items]
Change in deferred tax asset valuation allowance				3,100,000
Domestic Country [Member]
Income Taxes Disclosure [Line Items]
Deferred tax balance recorded	3,800,000
Deferred tax asset valuation allowance	4,100,000			4,100,000
Operating loss carryforwards	700,000			$ 700,000
Operating loss carryforwards expiration year				2037
Tax expense (benefit) of options exercised				$ 100,000	$ 300,000	$ 200,000
State and Local Jurisdiction [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards	300,000			$ 300,000
Operating loss carryforwards expiration year				2021
Netherlands [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards	500,000			$ 500,000
Netherlands [Member] | Earliest Tax Year [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards expiration year				2019
Netherlands [Member] | Latest Tax Year [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards expiration year				2025
United Kingdom [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards	3,300,000			$ 3,300,000
Belgium [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards	300,000			$ 300,000
Accounting Standards Update 201802 [Member]
Income Taxes Disclosure [Line Items]
Amount reclassified to retained earnings	$ 300,000
Maximum [Member]
Income Taxes Disclosure [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent					35.00%
Earnings of foreign subsidiaries		$ 0	$ 0		$ 0