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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Short-term investments, available-for-sale securities at fair value $ 803 $ 350
Accounts receivable, allowance for credit losses 218 0
Long-term investments, available-for-sale securities fair value $ 27,860 $ 29,717
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 77,619,000 79,652,000
Common stock, shares outstanding 77,619,000 49,063,000
Treasury stock, shares 197,000 30,590,000