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

Balance Sheet Detail - Summary Of Financial Assets Measured At Fair Value On A Recurring Bases (Details)

v3.21.2
Balance Sheet Detail - Summary Of Financial Assets Measured At Fair Value On A Recurring Bases (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents $ 783,108 $ 387,464 $ 246,521
Short-term Investments [Abstract]      
Short-term investments     349,958
Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 783,108 387,464 196,519
US Treasury Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents   0 50,002
Short-term Investments [Abstract]      
Short-term investments     349,958
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 783,108 387,464 196,519
Level 1 [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents $ 783,108 387,464 196,519
Level 1 [Member] | US Treasury Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents  
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents     50,002
Short-term Investments [Abstract]      
Short-term investments     349,958
Level 2 [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents    
Level 2 [Member] | US Treasury Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents     50,002
Short-term Investments [Abstract]      
Short-term investments     $ 349,958