Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE INVESTMENTS - Investments by Major Security Type (Details)

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AVAILABLE-FOR-SALE INVESTMENTS - Investments by Major Security Type (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 232,368 $ 167,602
Gross Unrealized Gains 3 0
Gross Unrealized Losses (1,040) (237)
Total Fair Value 231,331 167,365
Commercial Paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 121,659 76,961
Gross Unrealized Gains 3 0
Gross Unrealized Losses (294) (31)
Total Fair Value 121,368 76,930
Corporate Bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 99,877 84,771
Gross Unrealized Gains 0 0
Gross Unrealized Losses (662) (183)
Total Fair Value 99,215 84,588
Municipal Bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 10,832 5,870
Gross Unrealized Gains 0 0
Gross Unrealized Losses (84) (23)
Total Fair Value $ 10,748 $ 5,847