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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2024
Stockholders' Equity Note [Abstract] |
Stock-based Compensation Expense | The stock-based compensation related to our stock-based awards and employee stock purchase plan for the three and nine months ended September 30, 2024 and 2023 is as follows (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Cost of net revenues |  | $ | 3,070 |  |  | $ | 1,974 |  |  | $ | 7,716 |  |  | $ | 5,682 |
Selling, general and administrative |  | 34,937 |  |  | 29,739 |  |  | 97,705 |  |  | 87,432 |
Research and development |  | 11,032 |  |  | 7,889 |  |  | 29,434 |  |  | 22,083 |
Total stock-based compensation |  | $ | 49,039 |  |  | $ | 39,602 |  |  | $ | 134,855 |  |  | $ | 115,197 |
Summary Of Restricted Stock Units | A summary for the nine months ended September 30, 2024 is as follows:
| Number of Shares Underlying RSUs (in thousands) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Unvested as of December 31, 2023 | 736 |  |  | $ | 367.63 |  |  |  |  |
Granted | 638 |  |  | 309.22 |  |  |  |  |
Vested and released | (254) |  |  | 370.69 |  |  |  |  |
Forfeited | (56) |  |  | 345.74 |  |  |  |  |
Unvested as of September 30, 2024 | 1,064 |  |  | $ | 333.03 |  |  | 1.6 |  | $ | 270,565 |
Summary of MSU Performance Activity | The following table summarizes the MSU performance activity for the nine months ended September 30, 2024:
| Number of Shares Underlying MSUs (in thousands) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Unvested as of December 31, 2023 | 158 |  |  | $ | 811.06 |  |  |  |  |
Granted | 83 |  |  | 617.79 |  |  |  |  |
Vested and released 1 | (32) |  |  | 1,102.09 |  |  |  |  |
Forfeited | (5) |  |  | 1,102.09 |  |  |  |  |
Unvested as of September 30, 2024 | 204 |  |  | $ | 679.52 |  |  | 1.6 |  | $ | 51,876 |
1 Includes MSUs vested during the period below 100% of the original grant as actual shares released is based on Align’s stock performance relative to a market index over the vesting period.
Summary of PSU Performance Activity | The following table summarizes the PSU performance activity for the nine months ended September 30, 2024:
| Number of Shares Underlying PSUs (in thousands) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Unvested as of December 31, 2023 | $ | 5 |  |  | $ | 201.63 |  |  |  |  |
Granted | 6 |  |  | 206.36 |  |  |  |  |
Vested and released | — |  |  | — |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Unvested as of September 30, 2024 | $ | 11 |  |  | $ | 204.33 |  |  | 1.4 |  | $ | 2,805 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | The fair value of the option component of the 2010 Purchase Plan shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
|  |  |  | Nine Months Ended September 30,
|  |  |  |  |  | 2024 |  | 2023
Expected term (in years) |  |  |  |  |  | 1.3 |  | 1.2
Expected volatility |  |  |  |  |  | 49.2 | % |  | 56.2 | %
Risk-free interest rate |  |  |  |  |  | 4.6 | % |  | 4.9 | %
Expected dividends |  |  |  |  |  | — |  |  | — |
Weighted average fair value at grant date |  |  |  |  |  | $ | 94.70 |  |  | $ | 133.53 |

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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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