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Stock-Benefit Plans and Equity Transactions | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock-Benefit Plans and Equity Transactions | 10. Stock-Benefit Plans and Equity Transactions 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 |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Cost of sales |  | $ | 553 |  |  | $ | 554 |  |  | $ | 3,596 |  |  | $ | 1,037 |
Research and development |  |  | 4,159 |  |  |  | 5,614 |  |  |  | 7,803 |  |  |  | 9,929 |
Sales, general and administrative |  |  | 10,912 |  |  |  | 10,792 |  |  |  | 26,543 |  |  |  | 23,316 |
Total |  | $ | 15,624 |  |  | $ | 16,960 |  |  | $ | 37,942 |  |  | $ | 34,282 |
As of June 30, 2025, there wa s $75.1 million of unrecognized compensation expense for RSUs and PRSUs to be recognized over a weighted average perio d of 1.83 years. Restricted Stock Units and Performance Based Restricted Stock Units Awards The Company issued approximately 385,769 and 3,915,180 share s of common stock, before net share settlement, upon vesting of RSUs and PRSUs during the three and six months ended June 30, 2025, respectively. The Company issued approximately 309,000 and 3,473,000 shares of common stock, before net share settlement, upon vesting of RSUs and PRSUs during the three and six months ended June 30, 2024, respectively. Employee Stock Purchase Plan Employees are eligible to participate in the Employee Stock Purchase Plan ("ESPP") approved by its shareholders. During the three and six months ended June 30, 2025, there were approximately 319,220 shares issued under the ESPP. During the three and six months ended June 30, 2024, there were approximately 251,000 shares issued under the 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 and Six Months Ended |
|  | June 30, |
|  | 2025 |  |  | 2024 |
Risk-free interest rate |  | 4.30% - 4.44% |  |  | 5.40% - 5.41% |
Expected dividend yield |  |  | — |  |  |  | — |
Expected term (years) |  |  | 0.50 |  |  |  | 0.50 |
Volatility |  | 54.74% - 91.91% |  |  | 54.47% - 58.41% |
Warrants Outstanding Squadron Medical Warrants In connection with debt financing entered into with Squadron Medical Finance Solutions, LLC ("Squadron Medical") in 2018, and amended in 2019 and 2020, the Company issued common stock warrants to Squadron Medical and a participant lender (the “Squadron Medical Warrants”). The Squadron Medical Warrants expire in May 2027 and are exercisable by cash or cashless exercise. No Squadron Medical Warrants have been exercised as of June 30, 2025. Executive Warrants The Company issued warrants to its Chairman and Chief Executive Officer (the “Executive Warrants”). The Executive Warrants had a five-year term and are exercisable by cash or cashless exercise. In October 2022, the term was extended to seven years and in May 2024, the term was extended to nine years. No Executive Warrants have been exercised as of June 30, 2025. L-5 Healthcare Partners Warrants Pursuant to an order entered by the Delaware Chancery Court on September 27, 2024, the Company issued 1,133,160 common stock warrants, to L-5 Healthcare Partners, LLC, a stockholder of the Company (the "L-5 Healthcare Warrants"), at a purchase price of $1.98 per each share represented by the warrant, for a total purchase price of approximately $2.2 million. The L-5 Healthcare Warrants expire in August 2026 and are exercisable by cashless exercise. All L-5 Healthcare Warrants have been exercised as of June 30, 2025. A summary of all outstanding warrants for common stock as of June 30, 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
Other 1 |  |  | 90 |  |  | $ | 12.15 |  | Various through June 2026
Total |  |  | 8,177 |  |  |  |  |
(1) Weighted-average strike price. All outstanding warrants were deemed to qualify for equity classification under authoritative accounting guidance. Salary-to-Equity Conversion Program On March 31, 2025, the Compensation Committee of the Board of Directors of the Company adopted a salary conversion plan (the “Plan”) under which the cash payment of base salaries for certain Company executive officers was reduced by 10% to 50% and, in exchange, the Company's executive officers were granted RSUs. The RSUs granted under the Plan will vest in two equal installments on August 5, 2025 and December 5, 2025, subject to the respective executive officer's continued employment with the Company on each vesting date.

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