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Note 6 - Debt (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

Schedule of Long-Term Debt Instruments [Table Text Block]

​		September 30,
​		2024
​		(In thousands)
Principal amount		$	67,077
Unamortized debt premium, net of issuance costs and other			25,350
Total long-term debt		$	92,427

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

​		Three Months Ended				Nine Months Ended
​		September 30, 2024
​		(In thousands)
Contractual interest expense		$	2,433			$	3,147
Amortization of premium and debt issuance costs			(2,060	)			(2,659	)
Total interest expense		$	373			$	488

​		Three Months Ended								Nine Months Ended
​		September 30,								September 30,
​		2024				2023				2024				2023
​		(In thousands)								(In thousands)
Contractual interest expense		$	—			$	1,484			$	—			$	4,453
Amortization of debt issuance costs			—				179				—				528
Total		$	—			$	1,663			$	—			$	4,981

​		Three Months Ended								Nine Months Ended
​		September 30,								September 30,
​		2024				2023				2024				2023
​		(In thousands)								(In thousands)
Contractual interest expense		$	1,284			$	2,954			$	6,488			$	8,861
Amortization of debt issuance costs			144				312				713				922
Total interest expense		$	1,428			$	3,266			$	7,201			$	9,783

Convertible Debt [Table Text Block]

​		September 30,				December 31,
​		2024				2023
​		(In thousands)
Principal amount		$	97,862			$	215,924
Unamortized debt issuance costs			(830	)			(2,769	)
Total unsecured convertible senior notes, net		$	97,032			$	213,155
​						​
Fair value of outstanding unsecured convertible senior notes (1)		$	66,668			$	131,444

Schedule of Maturities of Long-Term Debt [Table Text Block]

		2026 Notes				Term Loan				Total
		(In thousands)
2025		$	—			$	20,000			$	20,000
2026			97,862				—				97,862
2027			—				—				—
2028			—				47,077				47,077
2029 and thereafter			—				—				—
Total principal payments			97,862				67,077				164,939
Unamortized premiums, discounts and issuance costs and other			(830	)			25,350				24,520
Carrying value of debt		$	97,032			$	92,427			$	189,459

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