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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Schedule Of Income Taxes [Line Items]        
Income (loss) of foreign subsidiaries before taxes $ 60,000 $ 133,000    
Deferred tax valuation allowance against assets 716,000   $ 716,000  
Income tax expense (benefit) $ 48,000 $ (65,000)    
Corporate tax rate     21.00% 34.00%
Deduction for U.S. federal tax 100.00%      
U.S. federal        
Schedule Of Income Taxes [Line Items]        
Net operating loss carry forwards, amount $ 1,000,000   $ 1,000,000  
Operating loss carryovers, limitations on use At June 30, 2018, the Company had $1.0 million of U.S. federal net operating loss (“NOL”) carry forwards. These losses do not expire but are limited to utilization of 80% of taxable income in any one year.      
Percentage of NOLs utilization limit against taxable income 80.00%      
U.S. federal | Earliest Tax Year        
Schedule Of Income Taxes [Line Items]        
Open tax years 2014      
U.S. federal | Latest Tax Year        
Schedule Of Income Taxes [Line Items]        
Open tax years 2017      
States        
Schedule Of Income Taxes [Line Items]        
Net operating loss carry forwards, amount $ 8,000,000   $ 8,000,000  
States | Earliest Tax Year        
Schedule Of Income Taxes [Line Items]        
Open tax years 2013      
States | Latest Tax Year        
Schedule Of Income Taxes [Line Items]        
Open tax years 2017