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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]          
Corporate tax rate   21.00% 35.00% 35.00%  
Amounts related to the remeasurement of federal deferred tax assets and liabilities   $ 1,200,000      
Amounts related to one-time transition tax on mandatory deemed repatriation of foreign earnings   400,000      
Cumulative foreign earnings from tax cuts and jobs act of 2017   $ 22,600,000      
Tax Cuts and Jobs Act of 2017, accounting complete   true      
Additional income tax expense due to tax cuts and jobs act of 2017   $ 400,000      
Long-term net deferred tax assets   1,100,000 $ 3,500,000    
Long-term net deferred tax liabilities   1,000,000 100,000    
Valuation allowance   2,574,000 2,686,000 $ 2,193,000 $ 1,534,000
Operating loss carryforwards related to a prior acquisition   3,200,000      
U.S. federal and state capital loss carryforwards   6,200,000      
Deferred tax assets, Capital loss carryforwards expires in 2020   1,600,000      
Deferred tax assets, Capital loss carryforwards expires in 2021   1,400,000      
Deferred tax assets, Capital loss carryforwards expires in 2022   3,200,000      
Unremitted earnings of U.S. deferred tax liability of foreign subsidiaries   0      
Unremitted earnings   13,800,000      
Unrecognized tax benefits   799,000 $ 806,000 1,774,000 $ 1,910,000
Unrecognized tax benefits, reversal       31,000  
Accrued interest and penalties related to uncertain tax positions       $ 100,000  
Scenario Forecast [Member]          
Income Taxes [Line Items]          
Unrecognized tax benefits, reversal $ 400,000        
Additional Tax expense $ 500,000        
Foreign Tax Authority [Member]          
Income Taxes [Line Items]          
Operating loss carryforwards   $ 20,800,000