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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Current investments, amortized cost $ 223,545 $ 137,124
Current investment, allowance for credit loss 0 0
Accounts receivable, allowance for credit losses 730 776
Non-current investments, amortized cost 476,148 587,981
Non-current investments, allowance for credit losses $ 0 $ 0
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock par value, in dollars per share $ 0.002 $ 0.002
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 172,631,000 175,481,000
Common stock, shares outstanding (in shares) 172,631,000 175,481,000