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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of stock-based compensation expense | The following table summarizes stock-based compensation expense:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(In thousands) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Selling, general and administrative |  | $ | 1,308 |  |  | $ | 2,422 |  |  | $ | 3,502 |  |  | $ | 4,240 |
Research and development |  |  | 134 |  |  |  | 1,295 |  |  | $ | 1,058 |  |  |  | 1,781 |
Total |  | $ | 1,442 |  |  | $ | 3,717 |  |  | $ | 4,560 |  |  | $ | 6,021 |
Summary of weighted-average assumptions used to calculate estimated value of stock options | Black-Scholes-Merton assumptions used in calculating the estimated value of stock options granted by Innoviva on the date of grant were as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2023 |  | 2022(1) |  | 2023 |  | 2022
Risk-free interest rate |  | 4.13% - 4.21% |  | —% |  | 3.50% - 4.21% |  | 1.60% - 3.03%
Expected term (in years) |  | 6.01 - 6.22 |  | — |  | 5.16 - 6.22 |  | 5.50 - 6.11
Volatility |  | 37.3% - 37.8% |  | —% |  | 37.3% - 38.5% |  | 38.8% - 40.5%
Dividend yield |  | —% |  | —% |  | —% |  | —%
Weighted-average estimated fair value of stock options granted |  | $5.66 - $5.97 |  | $— |  | $5.22 - $5.97 |  | $6.98 - $7.73
(1) There were no options granted for the three months ended September 30, 2022.

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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 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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