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Equity Incentive Plans and Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 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, 20227,655,769
Nonvested equity stock and stock units granted (1) (2)
(1,915,751)
Nonvested equity stock and stock units forfeited (1)
216,478
Total shares available for grant as of March 31, 20235,956,496
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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 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.
(2)    Amount includes approximately 0.2 million shares that have been reserved for potential future issuance related to certain performance unit awards granted in the first quarter of 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 three months ended March 31, 2023 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of March 31, 2023.
 Options Outstanding  
 (In thousands, except shares, per share amounts and years)
Number of
 Shares
Weighted-
 Average
 Exercise Price
 Per Share
Weighted-
 Average
 Remaining
 Contractual
 Term (years)
Aggregate
 Intrinsic
 Value
Outstanding as of December 31, 2022432,443$11.60   
Options exercised(80,841)$9.74  $3,356 
Outstanding as of March 31, 2023351,602$12.03 3.44$13,793 
Vested or expected to vest at March 31, 2023351,589$12.03 3.44$13,793 
Options exercisable at March 31, 2023339,935$11.99 3.34$13,351 
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 three months ended March 31, 2023:
Nonvested Equity Stock and Stock UnitsShares
Weighted-
 Average
 Grant-Date
 Fair Value
Nonvested at December 31, 20224,718,060$22.78 
Granted1,123,519$45.84 
Vested(1,402,672)$24.38 
Forfeited(119,799)$25.19 
Nonvested at March 31, 20234,319,108$30.70