General form of registration statement for all companies including face-amount certificate companies

Income Taxes - Additional Information (Detail)

v3.21.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]        
Statutory tax rate 21.00% 21.00% 21.00%  
Deferred tax assets, valuation allowance   $ 87,241 $ 30,525  
Operating loss carryforwards and tax credit carryforward, limitations on use   In the event the Company has a change of ownership, utilization of net operating losses and tax credit carryforwards may be limited. Certain acquired net operating losses and tax credits are subject to limitations.    
Unrecognzed tax benefits   $ 5,256 $ 2,360 $ 982
Unrecognized tax benefits that would impact effective tax rate   0    
Domestic Tax Authority [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   $ 298,616    
Operating loss carry forwards beginning expiration year   2037    
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward, amount   $ 17,760    
Tax credit carry forward beginning expiration year   2037    
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   $ 105,029    
Operating loss carry forwards beginning expiration year   2037    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward, amount   $ 9,028    
Tax credit carry forward beginning expiration year   2032