XML 40 R29.htm IDEA: XBRL DOCUMENT v3.25.2

Note 12 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2025

Notes Tables

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Three Months Ended								Six Months Ended
​		June 30,								June 30,
​		2025				2024				2025				2024
​		(In thousands)
		​				​				​				​
Research and development		$	915			$	1,069			$	1,951			$	2,083
Selling, general and administrative			1,150				1,699				2,567				3,343
Total stock-based compensation		$	2,065			$	2,768			$	4,518			$	5,426

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

​		Three Months Ended				Six Months Ended
​		June 30, 2025				June 30, 2025
Estimated weighted-average fair value		$	2.57			$	2.61
Weighted-average assumptions:		​				​
Expected volatility			101	%			101	%
Expected life, in years			7.3				7.3
Risk-free interest rate			4.13	%			4.13	%
Expected dividend yield			—	%			—	%

Share-Based Payment Arrangement, Activity [Table Text Block]

​		​				Weighted-				​				​
​		​				Average				​				Aggregate
​		​				Exercise				Remaining				Intrinsic
​		Options				Price per				Contractual Life				Value
​		Outstanding				Share				(In years)				(In thousands)
Balance at December 31, 2024			16,690,882			$	8.17
Granted			3,296,700				3.29
Exercised			(26,702	)			3.30
Forfeited			(245,766	)			14.20
Balance at June 30, 2025			19,715,114			$	7.28				6.4			$	558
Vested and expected to vest at June 30, 2025			18,974,796			$	7.44				6.3			$	534
Exercisable at June 30, 2025			12,469,143			$	9.63				4.9			$	288

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (f)(2)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_TableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration