Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity under its Stock Plans

During the nine months ended September 30, 2020, the Company had the following activities under its equity incentive plans:

		Available for Grant			Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Balance at December 31, 2019			2,192,545			9,287,901		$	9.44
	Shares authorized		2,000,000			-
	Granted (1)		(1,179,578	)		934,218			49.08
	Exercised (2)		92,459			(2,704,469	)		9.61
	Forfeited and expired (3)		122,135			(110,468	)		23.90
Outstanding at September 30, 2020			3,227,561			7,407,182		$	14.16		6.75	$	301,653,026
Vested and expected to vest, net of estimated forfeiture    at September 30, 2020						7,136,579		$	13.70		6.67	$	293,912,662
Exercisable at September 30, 2020						4,434,932		$	8.46		5.49	$	205,536,129

(1) The difference between shares granted in the number of shares available for grant and outstanding options represents the RSUs and RSAs granted for the period.

(2) Shares presented as available for grant represents shares repurchased for tax withholding upon vesting of RSUs.

(3) The difference between shares forfeited and expired in the number of shares available for grant and those outstanding represents RSUs canceled during the period.

Restricted Stock Activity

During the nine months ended September 30, 2020, the activity for restricted stock is summarized as follows:

	Shares			Weighted Average Grant-Date Fair Value
Balance at December 31, 2019		399,823		$	10.54
Granted		245,360			48.08
Vested		(230,986	)		9.98
Canceled		(11,667	)		10.95
Unvested at September 30, 2020		402,530		$	33.74