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Equity Incentive Plans and Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of shares available for grant
A summary of shares available for grant under the Company’s plans is as follows:
Shares Available for Grant
Total shares available for grant as of December 31, 202012,412,320
Stock options forfeited
54,327
Nonvested equity stock and stock units granted (1) (2)
(3,918,251)
Nonvested equity stock and stock units forfeited (1)
1,943,782
Total shares available for grant as of December 31, 202110,492,178
Nonvested equity stock and stock units granted (1) (3)
(4,107,633)
Nonvested equity stock and stock units forfeited (1)
1,271,224
Total shares available for grant as of December 31, 20227,655,769
Increase in shares approved for issuance (4)
5,210,000
Nonvested equity stock and stock units granted (1) (5)
(2,082,334)
Nonvested equity stock and stock units forfeited (1)
1,170,715
Total shares available for grant as of December 31, 202311,954,150
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(1)    For purposes of determining the number of shares available for grant under the 2015 Plan against the maximum number of shares authorized, each restricted stock unit granted prior to April 27, 2023 reduces the number of shares available for grant by 1.5 shares and each restricted stock unit forfeited increases shares available for grant by 1.5 shares. Each restricted stock unit granted on or after April 27, 2023 reduces the number of shares available for grant by 1.0 shares and each restricted stock unit forfeited increases shares available for grant by 1.0 shares.
(2)    Amount includes approximately 0.4 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in 2021 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below.
(3)    Amount includes approximately 0.6 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in 2022 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below.
(4)    On April 27, 2023, the Company’s stockholders approved these additional shares to be reserved for issuance under the 2015 Plan.
(5)    Amount includes approximately 0.2 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in 2023 and discussed under the section titled “Nonvested Equity Stock and Stock Units” below.
Schedule of stock option activity
The following table summarizes stock option activity under the Company’s equity incentive plans for the years ended December 31, 2023, 2022 and 2021 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of December 31, 2023:
Options OutstandingWeighted-Average Remaining Contractual Term (years)
(In thousands, except per share amounts and years)Number of SharesWeighted-Average Exercise Price Per ShareAggregate Intrinsic Value
Outstanding as of December 31, 2020964,211$11.08 
Options exercised
(360,303)$11.06 
Options forfeited
(54,327)$14.98 
Outstanding as of December 31, 2021549,581$10.71 
Options exercised
(117,138)$7.43 
Outstanding as of December 31, 2022432,443$11.60 
Options exercised
(307,711)$11.61 $17,430 
Outstanding as of December 31, 2023124,732$11.60 3.35$7,066 
Vested or expected to vest at December 31, 2023124,732$11.60 3.35$7,066 
Options exercisable at December 31, 2023124,732$11.60 3.35$7,066 
Weighted-average assumptions for employee stock purchase plan
Employee Stock Purchase Plan for Years Ended December 31,
202320222021
Employee Stock Purchase Plan
Expected stock price volatility
48%-53%
40%-44%
32%-33%
Risk free interest rate
5.14%-5.51%
1.49%-4.58%
0.04%-0.05%
Expected term (in years)
0.50.50.5
Weighted-average fair value of purchase rights granted under the purchase plan$14.86$8.02$5.17
Schedule of nonvested equity stock and stock units activity
The following table reflects the activity related to nonvested equity stock and stock units for the years ended December 31, 2023, 2022 and 2021:
Nonvested Equity Stock and Stock UnitsSharesWeighted-Average
Grant-Date Fair Value
Nonvested at December 31, 20204,851,265$12.82 
Granted
2,363,885$21.18 
Vested
(1,524,950)$12.41 
Forfeited
(971,815)$15.30 
Nonvested at December 31, 20214,718,385$16.62 
Granted
2,338,255$28.10 
Vested
(1,853,260)$14.42 
Forfeited
(485,320)$20.48 
Nonvested at December 31, 20224,718,060$22.78 
Granted
1,268,973$46.93 
Vested
(1,797,002)$18.07 
Forfeited
(759,839)$28.60 
Nonvested at December 31, 20233,430,192$32.90