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Investment Securities Table (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost $ 3,235 $ 4,740  
Debt Securities, Available-for-sale, Unrealized Loss 0 0  
Short-term investment securities 3,235 4,224 [1]  
Long-term investment securities 0 516  
Debt Securities, Available-for-sale 3,235 4,740  
Corporate Debt Securities      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost, Current 1,320 2,314  
Debt Securities, Available-for-sale, Noncurrent   516  
Debt Securities, Available-for-sale, Unrealized Loss 0 0  
Short-term investment securities 1,320 2,314  
Long-term investment securities   516  
US Treasury Securities      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost, Current 1,417 1,412  
Debt Securities, Available-for-sale, Unrealized Loss 0 0  
Short-term investment securities 1,417 1,412  
US Government Debt Securities      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost, Current 498 498  
Debt Securities, Available-for-sale, Unrealized Loss 0 0  
Short-term investment securities $ 498 $ 498 $ 498
[1] December 31, 2022 balances were derived from audited consolidated financial statements.