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Note 4 - Fair-Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

​		December 31, 2023
​						Gross Unrealized
		Amortized Cost				Gains/(Losses)				Estimated Fair Value
​		(In thousands)
​		​				​				​
U.S. government securities classified as short-term investments		$	102,100			$	19			$	102,119
Money-market funds classified as short-term investments			62,643				—				62,643
Total short-term investments			164,743				19				164,762
Certificate of deposit classified as non-current restricted investments			1,054				—				1,054
Total investments		$	165,797			$	19			$	165,816

​		December 31, 2022
​						Gross Unrealized
		Amortized Cost				Gains/(Losses)				Estimated Fair Value
​		(In thousands)
​		​				​				​
U.S. government securities classified as short-term investments		$	99,027			$	22			$	99,049
Money-market funds classified as short-term investments			84,882				—				84,882
Total short-term investments			183,909				22				183,931
Certificate of deposit classified as non-current restricted investments			1,054				—				1,054
Total investments		$	184,963			$	22			$	184,985

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		December 31, 2023
		Level 1				Level 2				Level 3				Total
		(In thousands)
U.S. government securities classified as short-term investments		$	—			$	102,119			$	—			$	102,119
Money-market funds classified as short-term investments			62,643				—				—				62,643
Total short-term investments			62,643				102,119				—				164,762
Money-market funds classified as non-current restricted investments			1,054				—				—				1,054
Total investments		$	63,697			$	102,119			$	—			$	165,816

		December 31, 2022
		Level 1				Level 2				Level 3				Total
		(In thousands)
U.S. government treasury bills classified as short-term investments		$	—			$	99,049			$	—			$	99,049
Money-market funds classified as short-term investments			84,882				—				—				84,882
Total short-term investments			84,882				99,049				—				183,931
Money-market funds classified as non-current restricted investments			1,054				—				—				1,054
Total investments		$	85,936			$	99,049			$	—			$	184,985

X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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+ References

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