Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.20.4
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Income Tax Contingency [Line Items]      
Valuation allowance   $ 48,100  
Deferred tax assets, valuation allowance   48,073 $ 12,977
Cumulative adjusted pre-tax book loss   (78,023) 23,294
Deferred tax assets operating loss carry forwards domestic   28,400  
Deferred tax assets, operating loss carryforwards, state and local   15,700  
Deferred tax assets, valuation allowance provided   35,100 35,100
Deferred tax assets other financial statement accrual assets   4,000  
Revision of Prior Period, Adjustment [Member]      
Income Tax Contingency [Line Items]      
Deferred tax assets, valuation allowance provided $ 35,100    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Revision of Prior Period, Adjustment [Member]      
Income Tax Contingency [Line Items]      
Cumulative adjusted pre-tax book loss   35,100  
Domestic Tax Authority [Member]      
Income Tax Contingency [Line Items]      
Valuation allowance   28,400  
Net operating loss carryforwards for federal income tax purpose   $ 135,300  
Beginning year of expiry for net operating loss carry forwards   2021  
Ending year of expiry for net operating loss carryforwards   2038  
Deferred tax assets, valuation allowance   $ 28,400 8,900
State and Local Jurisdiction [Member]      
Income Tax Contingency [Line Items]      
Valuation allowance   19,700  
Net operating loss carryforwards for federal income tax purpose   $ 610,800  
Beginning year of expiry for net operating loss carry forwards   2021  
Ending year of expiry for net operating loss carryforwards   2040  
Deferred tax assets, valuation allowance   $ 15,700 $ 4,100