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Investment Securities Table (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Short-term investment securities $ 13,191 $ 14,420 [1]
Debt Securities, Available-for-sale, Amortized Cost 15,028 19,040
Debt Securities, Available-for-sale, Amortized Cost, Current   14,420
Long-term investment securities 1,837 4,620
Debt Securities, Available-for-sale 15,028 19,040
Available-for-sale Debt Security Current [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss   0
Long-term Investments [Domain]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Noncurrent 1,837 4,620
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Long-term investment securities 1,837 $ 4,620
Corporate Bond Securities    
Debt Securities, Available-for-sale [Line Items]    
Short-term investment securities 11,787  
Debt Securities, Available-for-sale, Amortized Cost, Current 11,787  
Debt Securities, Available-for-sale, Unrealized Loss 0  
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Short-term investment securities 1,404  
Debt Securities, Available-for-sale, Amortized Cost, Current 1,404  
Debt Securities, Available-for-sale, Unrealized Loss $ 0  
[1] December 31, 2021 balances were derived from audited consolidated financial statements.