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

CASH EQUIVALENTS AND SHORT TERM INVESTMENTS (Details)

v3.21.2
CASH EQUIVALENTS AND SHORT TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Cash equivalents $ 413,089 $ 482,886 $ 65,455
Amortized Cost 155,855 111,876 84,679
Unrealized Gains 13 2 75
Unrealized losses (21) (11) 0
Fair Value 155,847 111,867 84,754
Total cash equivalents and short-term investments, Amortized Cost 568,944 594,762 150,134
Total cash equivalents and short-term investments, Fair Value 568,936 594,753 150,209
Assetbacked securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost     16,786
Unrealized Gains     20
Unrealized losses     0
Fair Value     16,806
U.S Treasury securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 5,000 19,995  
Unrealized Gains   2  
Unrealized losses   0  
Fair Value 5,000 19,997  
Commercial paper      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 89,835 43,911 19,938
Unrealized losses   0 0
Fair Value 89,835 43,911 19,938
Corporate bonds      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 61,020 47,970 47,955
Unrealized Gains 13   55
Unrealized losses (21) (11) 0
Fair Value 61,012 47,959 48,010
Commercial paper      
Debt Securities, Available-for-sale [Line Items]      
Cash equivalents   75,374  
Repurchase agreements      
Debt Securities, Available-for-sale [Line Items]      
Cash equivalents     25,001
Money market funds      
Debt Securities, Available-for-sale [Line Items]      
Cash equivalents $ 413,089 $ 407,512 $ 40,454