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Equity (Tables) | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Assumptions Used to Determine Fair Value of Stock Options Granted | The fair value of the stock options granted during the six months ended June 30, 2025 and 2024 was determined using the Black-Scholes option pricing model with the following assumptions:
| June 30, 2025 |  | June 30, 2024
Expected volatility (1) | 72.1 - 80.1% |  | 72.9 - 75.6%
Expected term (years) (2) | 5.5 - 5.7 |  | 5.4 - 5.5
Risk free interest rate (3) | 3.9% - 4.4% |  | 3.9% - 4.6%
Expected dividend yield | 0 | % |  | 0 | %
Exercise price | $6.61 - $17.70 |  | $24.94 - $47.00
(1) Expected volatility is calculated by utilizing the Company's historical volatility of its stock price over a period equal to the expected term. (2) Expected term is calculated based on the Company's historical experience. (3) Risk free interest rate is based on an interpolation of U.S. Treasury rates to reflect the expected term at the date of grant.
Schedule of Stock Option Activity | A summary of the stock option activity during the six months ended June 30, 2025 is presented below. Included in the table are stock options granted to employees and directors under the 2018 Plan, as well as options to purchase 255,611 shares of common stock granted to certain employees pursuant to the Nasdaq inducement grant exception in accordance with Nasdaq Listing Rule 5635(c)(4).
(dollars in millions, except weighted average exercise price) |  | Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2024 |  | 7,892,330 |  |  | $ | 44.16 |  |  | 6.7 |  | $ | 3.2 |
Granted |  | 2,165,498 |  |  | $ | 12.54 |  |  |  |  |
Cancelled/ Forfeited |  | (503,870) |  |  | $ | 44.26 |  |  |  |  |
Outstanding as of June 30, 2025 |  | 9,553,958 |  |  | $ | 37.31 |  |  | 6.9 |  | $ | 0.6 |
Vested and exercisable as of June 30, 2025 |  | 6,195,452 |  |  | $ | 45.06 |  |  | 5.7 |  | $ | — |
Vested and expected to vest as of June 30, 2025 |  | 9,212,437 |  |  | $ | 37.99 |  |  | 6.8 |  | $ | 0.5 |
Schedule of Restricted Stock Grant Activity | A summary of RSU activity during the six months ended June 30, 2025 is presented below. Included in the table are RSUs granted to employees and directors under the 2018 Plan, as well as RSUs representing 170,365 shares of common stock granted to certain employees pursuant to the Nasdaq inducement grant exception in accordance with Nasdaq Listing Rule 5635(c)(4).
|  | Shares |  | Weighted Average Grant Date Fair Value Per Share
Unvested RSUs as of December 31, 2024 |  | 2,311,291 |  |  | $ | 42.25 |
Granted |  | 3,382,825 |  |  | $ | 13.98 |
Vested |  | (911,874) |  |  | $ | 43.82 |
Cancelled / Forfeited |  | (628,701) |  |  | $ | 26.91 |
Unvested RSUs as of June 30, 2025 |  | 4,153,541 |  |  | $ | 21.28 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (c) -Paragraph 2 -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 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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