Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.20.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Tax Contingency [Line Items]              
Valuation allowance $ 49,800       $ 49,800   $ 4,100
Effective corporate income tax rate         21.00%    
Deferred tax assets, valuation allowance 49,800       $ 49,800   8,900
Cumulative adjusted pre-tax book loss (81,351)       (81,351)   (23,294)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 37,100          
Provision (benefit) for income taxes 1,500            
Provision for income taxes $ 401   $ 1,108   $ 31,180 $ 697  
Income Tax Rate Continuing Operations 54.90%   (5.90%)   (119.00%) 3.10%  
Revision of Prior Period, Adjustment [Member]              
Income Tax Contingency [Line Items]              
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 37,100   $ (300)      
Cumulative Effect, Period of Adoption, Adjustment [Member]              
Income Tax Contingency [Line Items]              
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       $ 300      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Revision of Prior Period, Adjustment [Member]              
Income Tax Contingency [Line Items]              
Cumulative adjusted pre-tax book loss $ 36,800       $ 36,800    
Domestic Tax Authority [Member]              
Income Tax Contingency [Line Items]              
Net operating loss carryforwards for federal income tax purpose             $ 136,100
Beginning year of expiry for net operating loss carry forwards             2021
Ending year of expiry for net operating loss carryforwards             2038
Provision (benefit) for income taxes         24,500    
State and Local Jurisdiction [Member]              
Income Tax Contingency [Line Items]              
Net operating loss carryforwards for federal income tax purpose             $ 793,700
Beginning year of expiry for net operating loss carry forwards             2020
Ending year of expiry for net operating loss carryforwards             2039
Provision (benefit) for income taxes         $ 12,300