Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Short-term investments, available-for-sale securities at fair value	$ 0	$ 340
Accounts receivable, allowance for credit losses	15	49
Long-term investments, available-for-sale securities fair value	$ 0	$ 8,913
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	78,688,000	78,088,000
Common stock, shares outstanding	78,391,000	77,889,000
Treasury stock, shares	297,000	198,000