Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]      
Tax computed at federal rate, percentage 21.00% 21.00% 35.00%
Tax Cuts and Jobs Act of 2017, completed accounting, income tax expense $ 0 $ 0 $ 11,644,000
State and Canadian net operating losses (NOLs) $ 14,000,000.0 9,400,000  
State and Canadian net operating losses (NOLs), expiration year 2033    
Valuation allowance, deferred tax assets $ 3,900,000 2,600,000  
Change in valuation allowance, deferred tax assets 1,400,000 677,000 $ 170,000
Decrease in unrecognized tax benefits that is reasonably possible 701,000    
Unrecognized tax benefits related to penalties $ 136,000 167,000  
Income Tax Examination, Description The Company is not currently under income tax examination by any taxing authority.    
Undistributed earnings of foreign subsidiary $ 0 $ 0  
Minimum [Member]      
Income Taxes [Line Items]      
Open tax years subject to tax examinations 2015    
Maximum [Member]      
Income Taxes [Line Items]      
Open tax years subject to tax examinations 2019