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Stock Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Options Activity Under the Plans
A summary of the Company's stock option activity under the Plans is as follows:
Number of OptionsWeighted-Average Exercise Price per ShareWeighted-Average Remaining Contractual Life (Years)
Aggregate Intrinsic Value(1)
Balance as of December 31, 2023
36,671 $16.09 7.45$24,481 
Granted— — 
Exercised(141)0.86 
Canceled and forfeited (3)
(20,774)21.38 
Balance as of September 30, 202415,756$9.24 7.14$10,862 
Exercisable as of September 30, 2024 (2)
11,936 $9.96 6.80$9,787 
Vested as of September 30, 202410,892$9.51 6.81$9,787 
(1) Intrinsic value is calculated based on the difference between the exercise price of in-the-money stock options and the fair value of the common stock as of the respective balance sheet dates.
(2) The 2011 Plan allows for early exercise of stock options. Accordingly, options granted under this plan are included as exercisable stock options regardless of vesting status.
(3) The forfeiture of the Executive Chairman Long-Term Performance Award resulted in 19,788 options forfeited.
Schedule of Share-based Compensation Expense Recognized in the Period
The following table presents the share-based compensation expense by award type recognized within the following line items in the Condensed Consolidated Statement of Operations and Comprehensive Loss and Condensed Consolidated Balance Sheet in the periods presented:
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Restricted stock units$27,903 $25,021 $80,722 $74,991 
Stock options5,837 6,858 18,422 19,651 
Performance restricted stock units
1,631 — 3,239 — 
Employee Stock Purchase Plan
283 256 875 1,269 
Share-based compensation recorded within Compensation and benefits
35,654 32,135 103,258 95,911 
Executive chairman long-term performance award
— 13,413 (144,617)39,801 
Property and equipment (capitalized internal-use software)
1,491 1,248 5,489 3,531 
Total share-based compensation expense (benefit)
$37,145 $46,796 $(35,870)$139,243 
Schedule ​of Unrecognized Compensation Costs by Award
Unrecognized compensation costs by award type as of September 30, 2024:
Unrecognized compensation costs
Weighted-average recognition period (in years)
Restricted stock units, inclusive of PSUs
$216,246 2.0
Stock options22,964 1.5
Total
$239,210