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Note 4 - Investments and Fair-Value Measurements (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

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

​		September 30, 2024
​						Gross Unrealized
		Amortized Cost				Gains/(Losses)				Estimated Fair Value
​		(In thousands)
​		​				​				​
U.S. government securities classified as short-term investments		$	19,924			$	4			$	19,928
Money-market funds classified as short-term investments			101,712				—				101,712
Total short-term investments			121,636				4				121,640
Certificate of deposit classified as non-current restricted investments			1,054				—				1,054
Total investments		$	122,690			$	4			$	122,694

​		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

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

​		September 30, 2024
​		Level 1				Level 2				Level 3				Total
​		(In thousands)
Assets:		​				​				​				​
U.S. government securities classified as short-term investments		$	—			$	19,928			$	—			$	19,928
Money-market funds classified as short-term investments			101,712				—				—				101,712
Total short-term investments			101,712				19,928				—				121,640
Certificate of deposit classified as non-current restricted investments			1,054				—				—				1,054
Total investments		$	102,766			$	19,928			$	—			$	122,694

​		December 31, 2023
​		Level 1				Level 2				Level 3				Total
​		(In thousands)
Assets:		​				​				​				​
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
Certificate of deposit classified as non-current restricted investments			1,054				—				—				1,054
Total investments		$	63,697			$	102,119			$	—			$	165,816

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
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-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
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-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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Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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