XML 95 R77.htm IDEA: XBRL DOCUMENT v3.20.2
Income Tax - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Tax Disclosure [Abstract]          
Effective income tax rate 0.70% (5.70%) (0.70%) (0.50%)  
Unrecognized tax benefits $ 0 $ 0 $ 0 $ 0  
Interest or penalties related to uncertain tax positions 0 $ 0 0 $ 0  
Liabilities for interest and potential penalties $ 0   $ 0   $ 0