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Stock-Benefit Plans and Equity Transactions (Tables) | 3 Months Ended
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Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Summary of Total Stock Based Compensation | The Company has stock-based compensation plans under which it grants stock options, restricted stock units ("RSUs"), and performance restricted stock units ("PRSUs") to officers, directors and third parties. Total stock-based compensation for the periods presented is as follows (in thousands):
|  | Three Months Ended |  |
|  | March 31, |  |
|  | 2025 |  |  | 2024 |  |
Cost of sales |  | $ | 3,043 |  |  | $ | 483 |  |
Research and development |  |  | 3,644 |  |  |  | 4,315 |  |
Sales, general and administrative |  |  | 15,631 |  |  |  | 12,524 |  |
Total |  | $ | 22,318 |  |  | $ | 17,322 |  |
Schedule of Assumptions used to Estimate Fair Value of Stock Options Granted and Stock Purchase Rights under ESPP | The Company estimates the fair value of shares issued to employees under the ESPP using the Black-Scholes option-pricing model. The assumptions used to estimate the fair value of stock options granted and stock purchase rights under the ESPP are as follows:
|  | Three Months Ended |
|  | March 31, |
|  | 2025 |  |  | 2024 |
Risk-free interest rate |  |  | 4.44 | % |  |  | 5.41 | %
Expected dividend yield |  |  | — |  |  |  | — |
Expected term (years) |  |  | 0.50 |  |  |  | 0.50 |
Volatility |  |  | 91.91 | % |  |  | 58.41 | %
Summary of All Outstanding Warrants for Common Stock | A summary of all outstanding warrants for common stock as of March 31, 2025, is as follows (in thousands, except for strike price data):
|  | Number of Warrants |  |  | Strike Price |  | Expiration
2018 Squadron Medical Warrants |  |  | 845 |  |  | $ | 3.15 |  | May 2027
2019 Squadron Medical Warrants |  |  | 4,839 |  |  | $ | 2.17 |  | May 2027
2020 Squadron Medical Warrants |  |  | 1,076 |  |  | $ | 4.88 |  | May 2027
Executive Warrants |  |  | 1,327 |  |  | $ | 5.00 |  | December 2026
L-5 Healthcare Warrants |  |  | 1,133 |  |  | $ | 2.17 |  | August 2026
Other 1 |  |  | 96 |  |  | $ | 11.79 |  | Various through June 2026
Total |  |  | 9,316 |  |  |  |  |
(1) Weighted-average strike price.

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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-1 + Details
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