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Note 4 - Fair-value Measurements - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands

Jun. 30, 2025

May 15, 2025

May 14, 2025

Dec. 31, 2024

The 2029 Notes [Member]

Embedded derivative

$ (15,020)

The 2029 Notes [Member] | Conversion Option Derivative [Member]

Embedded derivative

(15,000)

$ (23,000)

$ (23,000)

Fair Value, Recurring [Member]

Total Assets

27,894

$ 87,786

Share-settled liability

(7,627)

Total Liabilities

235

Total Liabilities

(22,534)

Fair Value, Recurring [Member] | The Credit and Guaranty Agreement [Member] | Initial Term Loan [Member] | Call and Put Options Derivative [Member]

Embedded derivative

^[1]

235

Embedded derivative

^[2]

113

Fair Value, Recurring [Member] | The 2029 Notes [Member] | Conversion Option Derivative [Member]

Embedded derivative

(15,020)

Certificates of Deposit [Member] | Fair Value, Recurring [Member]

Certificate of deposit classified as non-current restricted investments

1,054

1,054

Money Market Funds [Member] | Fair Value, Recurring [Member]

Money-market funds

26,840

86,732

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]

Total Assets

27,894

87,786

Share-settled liability

0

Total Liabilities

0

Total Liabilities

0

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | The Credit and Guaranty Agreement [Member] | Initial Term Loan [Member] | Call and Put Options Derivative [Member]

Embedded derivative

^[1]

0

Embedded derivative

^[2]

0

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | The 2029 Notes [Member] | Conversion Option Derivative [Member]

Embedded derivative

0

Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] | Fair Value, Recurring [Member]

Certificate of deposit classified as non-current restricted investments

1,054

1,054

Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Fair Value, Recurring [Member]

Money-market funds

26,840

86,732

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]

Total Assets

0

0

Share-settled liability

(7,627)

Total Liabilities

235

Total Liabilities

(22,534)

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | The Credit and Guaranty Agreement [Member] | Initial Term Loan [Member] | Call and Put Options Derivative [Member]

Embedded derivative

^[1]

235

Embedded derivative

^[2]

113

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | The 2029 Notes [Member] | Conversion Option Derivative [Member]

Embedded derivative

(15,020)

Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member] | Fair Value, Recurring [Member]

Certificate of deposit classified as non-current restricted investments

0

0

Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | Fair Value, Recurring [Member]

Money-market funds

$ 0

$ 0

[1]	While the Term Loan is recorded as a liability, the embedded call and put options that have been identified as requiring bifurcation are recognized as a net embedded derivative asset reflected as a component of the Term Loan on the balance sheet.
[2]	While the Term Loan is recorded as a liability, the embedded call and put options that have been identified as requiring bifurcation are recognized as a net embedded derivative asset reflected as a component of the Term Loan on the balance sheet.

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