Annual report pursuant to Section 13 and 15(d)

Cash, Cash Equivalents and Restricted Cash and Short-Term Investments - Narrative (Details)

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Cash, Cash Equivalents and Restricted Cash and Short-Term Investments - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]      
Total cash, cash equivalents, restricted cash and short-term investments $ 389,400,000 $ 466,078,000  
Available-for-sale debt securities 295,500,000 215,000,000  
Held-to-maturity securities corporate bond 0 19,228,000  
Interest receivable 1,100,000 100,000  
Unrealized gains (losses) on available-for-sale securities $ (300,000) $ (47,000) $ (47,000)