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Note 6 - Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Convertible Debt [Table Text Block]

		*Balance as of December 31, 2023*
		*2023 Notes*				*2026 Notes*				*Total*
		(In thousands)
Principal amount		$	—			$	215,924			$	215,924
Unamortized debt issuance costs			—				(2,769	)			(2,769	)
Total convertible senior notes, net		$	—			$	213,155			$	213,155

Fair value of outstanding convertible senior notes ⁽¹⁾		$	—			$	131,444

		*Balance as of December 31, 2022*
		*2023 Notes*				*2026 Notes*				*Total*
		(In thousands)
Principal amount		$	95,000			$	225,030			$	320,030
Unamortized debt issuance costs			(619	)			(4,124	)			(4,743	)
Total convertible senior notes, net		$	94,381			$	220,906			$	315,287

Fair value of outstanding convertible senior notes ⁽¹⁾		$	92,031			$	118,141

Schedule Of Debt Instrument, Interest Expense Recognized [Table Text Block]

		*Year Ended December 31,*
		*2023*				*2022*				*2021*
		(In thousands)
Contractual interest expense		$	5,195			$	5,938			$	5,938
Amortization of debt issuance costs			619				663				618
Total interest expense		$	5,814			$	6,601			$	6,556

		*Year Ended December 31,*
		*2023*				*2022*				*2021*
		(In thousands)
Contractual interest expense		$	11,774			$	11,814			$	11,814
Amortization of debt issuance costs			1,355				1,167				1,078
Total interest expense		$	13,129			$	12,981			$	12,892