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Equity Incentive Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Share-based Awards Available for Grant under 2016 Plan
A summary of share-based awards available for grant under the 2016 Equity Incentive Plan is as follows:
Awards Available for Grant
Balance at December 31, 20195,528,132 
Additional awards authorized1,333,928 
Awards granted(595,915)
Awards forfeited156,623 
Awards withheld for tax purposes82,622 
Balance at December 31, 20206,505,390 
Awards granted(470,959)
Awards forfeited44,394 
Awards withheld for tax purposes128,998 
Balance at March 31, 20216,207,823 
Summary of Stock Option Activity Under 2006 and 2016 Plans
The following table summarizes stock option activity under the 2006 and 2016 Equity Incentive Plans:
Options Outstanding
Options
Outstanding		Weighted-
Average
Exercise
Price Per
Share		Weighted-
Average
Remaining
Contractual
Life (years)		Aggregate
Intrinsic Value
(in thousands)
Balance at December 31, 20191,503,247 $27.40 6.43$62,401 
Options exercised(868,614)$17.31 
Options forfeited(24,752)$66.89 
Balance at December 31, 2020609,881 $40.18 6.24$120,163 
Options exercised(56,111)$28.09 
Options forfeited(706)$78.89 
Balances at March 31, 2021553,064 $41.36 6.05$53,923 
Options exercisable – March 31, 2021469,148 $36.51 5.88$48,016 
Options vested and expected to vest – March 31, 2021550,842 $41.24 6.05$53,774