Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
U.S. federal corporate statutory tax rate		35.00%
One-time transition tax period payable on mandatory deemed repatriation of cumulative foreign earnings		8 years
Reduction in net deferred tax assets and liabilities		$ 4,819,000
Provisional amount recorded related to deemed repatriation of foreign earnings		6,426,000
Aggregate undistributed earnings of foreign subsidiaries		15,400,000
Unrecognized deferred income tax liability of the foreign subsidiaries		$ 1,000,000
State and local net operating loss carry forwards year start		2018
State and local net operating loss carry forwards year end		2037
Valuation reserve		$ 3,900,000	$ 3,100,000
Additional income tax expense (benefit)		$ 1,000,000	200,000	$ 600,000
Income tax positions recognized, minimum percentage		50.00%
Expense for interest and penalties		$ 0	$ 0	$ 0
Maximum [Member]
Income Taxes [Line Items]
Decrease in amount of accrual for uncertain tax positions		500,000
Federal Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carry forward		4,900,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carry forward		23,400,000
Overseas Jurisdictions [Member]
Income Taxes [Line Items]
Net operating loss carry forward		$ 8,800,000
Scenario Forecast [Member]
Income Taxes [Line Items]
U.S. federal corporate statutory tax rate	21.00%