13. Stock-based Compensation
Employee stock-based compensation plans
Under the 2016 Equity and Incentive Compensation Plan Amended and Restated as of June 11, 2025 (the "2016 Equity Plan"), we may grant incentive stock options, nonstatutory stock options, stock appreciation rights, restricted stock, restricted stock units, other stock awards and cash incentive awards to employees, directors and consultants. Our Compensation Committee of the Board of Directors administers this plan and the stock-based awards are granted under terms determined by it.
The total number of authorized stock-based awards available under our plan was 4,003,142 as of December 31, 2025. We issue common stock from our pool of authorized stock upon exercise of stock options and stock appreciation rights, vesting of restricted stock units or upon granting of restricted stock.
During the years ended December 31, 2025, 2024 and 2023, we have issued three types of awards under our plans: restricted stock awards, time-based restricted stock units, and performance-based restricted stock units. The following table sets forth the number of awards outstanding for each award type as of:
Outstanding at December 31,
Award type2025 2024
Restricted stock awards
670,964 
814,336 
Time-based restricted stock units
609,094 
616,035 
Performance-based restricted stock units
937,090 
1,029,214 
Awards granted to our executive officers and certain other employees are subject to accelerated vesting upon a change in control as defined in the employees’ employment agreement or retention agreement, and continued vesting in accordance with our Long-term Incentive Retirement Program, subject to satisfaction of applicable retirement eligibility requirements and required approvals.
Expense recognition
We recognize compensation expense associated with stock options and awards with performance or market based vesting conditions on an accelerated basis over the requisite service period of the individual grantees. We recognize compensation expense associated with restricted stock awards and SARs on a straight-line basis over the requisite service period of the individual grantees, which equals the vesting period. We recognize the effect of awards for which the requisite service period is not rendered when the award is forfeited (that is, we recognize the effect of forfeitures in compensation cost when they occur). Previously recognized compensation cost for an award is reversed in the period that the award is forfeited.
Stock-based compensation expense is allocated to cost of revenue and operating expenses on the consolidated statements of comprehensive loss based on where the associated employee’s compensation is recorded. The following table summarizes stock-based compensation expense:
Years ended December 31,
(in thousands)202520242023
Included in cost of revenue:
$
11,517 
$
14,092 
$
16,658 
Included in operating expenses:
Sales, marketing and customer success
16,072 
17,946 
24,892 
Research and development
24,252 
26,488 
30,780 
General and administrative
41,069 
46,442 
55,432 
Total included in operating expenses
81,393 
90,876 
111,104 
Total stock-based compensation expense
$
92,910 
$
104,968 
$
127,762 
The total amount of compensation cost related to unvested awards not recognized was $61.9 million at December 31, 2025. It is expected that this amount will be recognized over a weighted average period of 1.2 years.
Restricted stock awards
We have granted shares of common stock subject to certain restrictions under the 2016 Equity Plan. Restricted stock awards granted to employees vest in equal annual installments generally over three years from the grant date subject to the recipient’s continued employment with us. Restricted stock awards granted to non-employee directors vest after one year from the date of grant or, if earlier, immediately prior to the next annual election of directors, provided the non-employee director is serving as a director at that time. The fair market value of the stock at the time of the grant is amortized on a straight-line basis to expense over the period of vesting. Recipients of restricted stock awards have the right to vote such shares and receive dividends, if declared.
The following table summarizes our unvested restricted stock awards as of December 31, 2025, and changes during the year then ended:
Restricted
stock awards
Weighted
average
grant-date
fair value
Aggregate
intrinsic value(1)
(in thousands)
Unvested at January 1, 2025
814,336 
$
66.27 
Granted
373,318 
67.37 
Forfeited
(52,165)
66.60 
Vested
(464,525)
65.48 
Unvested at December 31, 2025
670,964 
67.00 
$
42,485 
(1)The intrinsic value is calculated as the market value as of the end of the fiscal period.
The total fair value of restricted stock awards that vested during the years ended December 31, 2025, 2024 and 2023 was $30.4 million, $42.7 million and $42.7 million, respectively. The weighted average grant-date fair value of restricted stock awards granted during the years ended December 31, 2024 and 2023 was $69.86 and $62.59, respectively.
Restricted stock units
We have also granted restricted stock units subject to certain restrictions under the 2016 Equity Plan. Restricted stock units granted to employees vest in equal annual installments generally over three years from the grant date subject to the recipient’s continued employment with us. We have also granted restricted stock units for which vesting is subject to meeting certain performance conditions. The fair market value of the stock at the time of the grant is amortized to expense on a straight-line basis over the period of vesting except for awards with performance conditions, which are amortized on an accelerated basis over the period of vesting.
The following table summarizes our unvested, time-based restricted stock units as of December 31, 2025, and changes during the year then ended:
Time-based restricted
stock units
Weighted
average
grant-date
fair value
Aggregate
intrinsic value(1)
(in thousands)
Unvested at January 1, 2025
616,035 
$
65.08 
Granted
309,834 
68.45 
Forfeited
(13,317)
66.52 
Vested
(303,458)
64.69 
Unvested at December 31, 2025
609,094 
66.77 
$
38,567 
(1)The intrinsic value is calculated as the market value as of the end of the fiscal period.
The total fair value of time-based restricted stock units that vested during the years ended December 31, 2025, 2024 and 2023 was $19.6 million, $19.4 million and $13.5 million, respectively. The weighted average grant date fair value of time-based restricted stock units granted for the years ended December 31, 2024 and 2023 was $67.73 and $61.37, respectively.
The following table summarizes our unvested, performance-based restricted stock units as of December 31, 2025, and changes during the year then ended:
Performance-based restricted
stock units
Weighted
average
grant-date
fair value
Aggregate
intrinsic value(1)
(in thousands)
Unvested at January 1, 2025
1,029,214 
$
66.92 
Granted
734,645 
70.02 
Forfeited
(51,909)
69.03 
Vested(2)
(774,860)
67.52 
Unvested at December 31, 2025
937,090 
67.93 
$
59,337 
(1)The intrinsic value is calculated as the market value as of the end of the fiscal period.
(2)This amount represents the target number of shares that were eligible to be earned and vested. The number of shares earned and vested based on actual results when compared to the performance conditions was 758,777 and those shares had a weighted average grant date fair value of $67.52.
The total fair value of performance-based restricted stock units that vested during the years ended December 31, 2025, 2024 and 2023 was $52.3 million, $55.5 million, and $50.9 million, respectively. The weighted average grant date fair value of performance-based restricted stock units granted for the years ended December 31, 2024 and 2023 was $67.90 and $59.62, respectively.

Historical Timeline

Fiscal YearFiled
2025Feb 18, 2026Showing above
2024Feb 21, 2025
2023Feb 21, 2024

About Stock Compensation Disclosures

Stock-based compensation disclosures detail the equity awards granted to employees and executives — including stock options, restricted stock units (RSUs), and performance shares — along with the valuation methods and assumptions used to expense them. This section reveals the true cost of talent retention and the alignment between management incentives and shareholder interests.

Key signals: total unrecognized compensation expense and its expected recognition period signal future earnings headwinds from already-granted awards. For stock options, examine Black-Scholes assumptions — expected volatility, risk-free rate, and expected term — as understating any of these reduces reported compensation expense. Compare stock compensation expense as a percentage of revenue against peers to assess dilution cost. Watch vesting schedules for acceleration clauses tied to change-of-control events. Performance-based awards with undemanding targets may indicate weak governance. Add back stock compensation to operating cash flow to calculate a more conservative free cash flow figure.