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Equity Incentive Plans
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Equity Incentive Plans Equity Incentive Plans
Equity Incentive Plan Activity
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, 20184,717,292  
Additional awards authorized1,218,402  
Awards granted(649,911) 
Awards forfeited181,513  
Awards withheld for tax purposes60,836  
Balance at December 31, 20195,528,132  
Additional awards authorized1,333,928  
Awards granted(286,155) 
Awards forfeited110,981  
Awards withheld for tax purposes51,475  
Balance at March 31, 20206,738,361  
During the three months ended March 31, 2020, 286,155 restricted stock units ("RSUs") were granted, 130,920 RSUs vested, and 94,155 RSUs were forfeited.
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, 20182,094,137  $23.20  7.02$97,976  
Options granted20,010  $82.77  
Options exercised(540,307) $9.59  
Options forfeited(70,593) $54.54  
Balance at December 31, 20191,503,247  $27.40  6.43$62,401  
Options exercised(264,800) $11.21  
Options forfeited(16,826) $68.32  
Balances at March 31, 20201,221,621  $30.35  6.39$62,595  
Options exercisable – March 31, 2020941,215  $23.59  6.05$54,482  
Options vested and expected to vest – March 31, 20201,210,815  $30.07  6.38$62,368  
The aggregate intrinsic values of options outstanding, exercisable, vested and expected to vest were calculated as the difference between the exercise price of the options and the closing price of the Company’s common stock.
During the three months ended March 31, 2019, the Company granted options with a weighted-average grant date fair value of $38.65 per share. The Company did not grant any options during the three months ended March 31, 2020.