Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.10.0.1
Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Jan. 01, 2017
Income Taxes [Line Items]          
Federal statutory rate (as a percent) 21.00% 34.00% 34.00%    
Cumulative effect of new accounting principle in period of adoption       $ 35,000 $ 6,388,000
Deferred tax assets, valuation allowance $ 323,000 $ 0      
Interest and penalties 100,000        
Accounting Standards Update 2016-09          
Income Taxes [Line Items]          
Cumulative effect of new accounting principle in period of adoption   $ 6.4      
Federal And State Tax          
Income Taxes [Line Items]          
Operating loss carryforwards 71,300,000        
State and Local Jurisdiction          
Income Taxes [Line Items]          
Operating loss carryforwards $ 33,000,000.0