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Note 6 - Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2026
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Stock Options Outstanding |
|  | Number of Shares |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Life |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  |  |  | (in years) |  |  | (in thousands) |
Balances—December 31, 2025 |  |  | 13,086,288 |  |  | $ | 11.87 |  |  |  | 6.99 |  |  | $ | 58,029 |
Granted |  |  | 72,104 |  |  |  | 17.51 |  |  |  |  |  |  |  |  |
Exercised |  |  | (339,840 | ) |  |  | 5.14 |  |  |  |  |  |  |  |  |
Canceled |  |  | (1,699,202 | ) |  |  | 6.42 |  |  |  |  |  |  |  |  |
Balances—March 31, 2026 |  |  | 11,119,350 |  |  | $ | 12.95 |  |  |  | 6.39 |  |  | $ | 102,320 |
Exercisable—March 31, 2026 |  |  | 5,121,924 |  |  | $ | 13.84 |  |  |  | 4.48 |  |  | $ | 45,833 |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Cost of product revenue |  | $ | 44 |  |  | $ | — |
Research and development |  |  | 1,758 |  |  |  | 2,762 |
Selling, general and administrative |  |  | 110 |  |  |  | 2,919 |
Total stock-based compensation expense |  | $ | 1,912 |  |  | $ | 5,681 |
|  | Three Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Service-based options |  | $ | 2,692 |  |  | $ | 4,107 |
Market-based options |  |  | (907 | ) |  |  | 1,469 |
Restricted stock units |  |  | 31 |  |  |  | — |
ESPP |  |  | 96 |  |  |  | 105 |
Total stock-based compensation expense |  | $ | 1,912 |  |  | $ | 5,681 |
Share-Based Payment Arrangement, Option [Member] |
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| Three Months Ended March 31, |
| 2026 |  | 2025 |
Service-Based Stock Options |  |  |  |  |  |
Expected term (in years) |  | 5.1 - 6.3 |  |  | 5.0 - 6.9 |
Expected volatility |  | 93% - 95% |  |  | 93% - 100% |
Risk-free interest rate |  | 3.7% - 3.8% |  |  | 4.1% - 4.6% |
Expected dividend yield |  | — |  |  | — |
Market-Based, and Market and Performance-Based Stock Options |  |  |  |  |  |
Expected term (in years) |  | — |  |  | 5.5 - 8.9 |
Expected volatility |  | — |  |  | 90% |
Risk-free interest rate |  | — |  |  | 4.4% - 4.6% |
Expected dividend yield |  | — |  |  | — |
ESPP |  |  |  |  |  |
Expected term (in years) |  | 0.5 - 1.0 |  |  | 0.5 - 1.0 |
Expected volatility |  | 71.7% - 86.6% |  |  | 98% |
Risk-free interest rate |  | 3.6% - 3.7% |  |  | 4.1% - 4.3% |
Expected dividend yield |  | — |  |  | — |

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- 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
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, 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)(1) -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
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- 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
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