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Note 6 - Debt (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Schedule of Debt [Table Text Block]

​			June 30,				December 31,
​			2025				2024
​			(In thousands)
Exchange of 2026 Notes for common stock (share-settled liability)	Short-term		$	7,627			$	—
Convertible senior notes, net maturing on June 15, 2029 (2029 Notes)	Long-term			63,474				—
				71,101				—
Term debt, net maturing on June 3, 2028 (Term Loan)	Short-term			—				21,000
Term debt, net maturing on June 3, 2028 (Term Loan)	Long-Term			87,313				69,405
				87,313				90,405
Convertible senior notes, net maturing on February 15, 2026 (2026 Notes)	Short-term			17,017				—
Convertible senior notes, net maturing on February 15, 2026 (2026 Notes)	Long-term			—				97,178
				17,017				97,178
			$	175,431			$	187,583

Convertible Debt [Table Text Block]

​		June 30,
​		2025
​		(In thousands)
Principal amount		$	70,785
Unamortized debt discount, net of issuance costs			(22,331	)
Fair value of embedded derivative			15,020
Total unsecured convertible senior notes, net		$	63,474
​		​
Fair value of outstanding unsecured convertible senior notes (1)		$	59,263

​		June 30,				December 31,
​		2025				2024
​		(In thousands)
Principal amount		$	17,077			$	97,862
Unamortized debt issuance costs			(60	)			(684	)
Total unsecured convertible senior notes, net		$	17,017			$	97,178
Fair value of outstanding unsecured convertible senior notes (1)		$	16,048			$	93,752

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

		Three and Six Months Ended
		June 30,
		2025
		(In thousands)
Contractual interest expense		$	859
Amortization of debt discount and issuance costs			748
Total interest expense		$	1,607

​		Three Months Ended								Six Months Ended
		June 30,								June 30,
​		2025				2024				2025				2024
​		(In thousands)
Contractual interest expense		$	2,231			$	714			$	4,464			$	714
Amortization of debt premium and issuance costs			(1,306	)			(599	)			(3,214	)			(599	)
Total interest expense		$	925			$	115			$	1,250			$	115

​		Three Months Ended								Six Months Ended
​		June 30,								June 30,
​		2025				2024				2025				2024
​		(In thousands)
Contractual interest expense		$	790			$	2,369			$	2,074			$	5,203
Amortization of debt discount and issuance costs			92				261				240				569
Total interest expense		$	882			$	2,630			$	2,314			$	5,772

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

​		June 30,				December 31,
​		2025				2024
​		(In thousands)
Principal amount		$	67,077			$	67,077
Unamortized debt premium, net of issuance costs and other			20,349				23,563
Fair value of embedded derivative			(113	)			(235	)
Total term debt, net		$	87,313			$	90,405

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

		2026 Notes				Term Loan				2029 Notes				Total
		(In thousands)
2025		$	—			$	—			$	—			$	—
2026			17,077				—				—				17,077
2027			—				—				—				—
2028			—				67,077				—				67,077
2029 and thereafter			—				—				70,785				70,785
Total principal payments			17,077				67,077				70,785				154,939
Net unamortized premiums, discounts, derivatives and issuance costs			(60	)			20,236				(7,311	)			12,865
Carrying value of debt		$	17,017			$	87,313			$	63,474			$	167,804

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