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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination [Line Items]        
Corporate income tax rate   35.00% 35.00% 35.00%
Estimated tax expense for one-time transition tax of Tax Act   $ 338,000    
Provisional benefit related to net change in deferred tax liabilities due to reduction in tax rate   3,000,000    
Net operating loss carryforward   161,000 $ 109,000,000 $ 157,000,000
Income tax examination net of federal and state tax benefit, accrued interest   24,000 $ 29,000  
Reduction in income tax liability if tax positions sustained   182,000    
Change in unrecognized tax benefits reasonably possible   $ 32,000    
Income tax examination years description   The Company is no longer subject to U.S. Federal income tax examinations for the years prior to 2014.    
State Jurisdiction        
Income Tax Examination [Line Items]        
Net operating loss carryforward   $ 13,000,000    
Net operating loss carryforward expiration   2026    
State Jurisdiction | Minimum        
Income Tax Examination [Line Items]        
Income tax examination year   2013    
State Jurisdiction | Maximum        
Income Tax Examination [Line Items]        
Income tax examination year   2016    
Foreign        
Income Tax Examination [Line Items]        
Net operating loss carryforward   $ 10,600,000    
Net operating loss carryforward expiration   2020    
Scenario Plan        
Income Tax Examination [Line Items]        
Corporate income tax rate 21.00%