Stockholders' Equity (Tables)

9 Months Ended

Oct. 03, 2020

Share-based Payment Arrangement [Abstract]

Schedule of stock option activity

Stock option activity under the equity incentive plans was as follows (in thousands, except per share amounts):

	Stock Options Outstanding
	Number of Shares Subject to Stock Options	Weighted– Average Exercise Price		Aggregate Intrinsic Value (1)
Balance—December 31, 2019	12,871	$	3.51
Granted	—
Exercised	(1,469)	$	2.04
Forfeited or canceled	(147)	$	6.96
Balance—October 3, 2020	11,255	$	3.66	$	40,248
Stock options vested and expected to vest—October 3, 2020	11,255	$	3.66	$	40,248
Stock options exercisable—October 3, 2020	11,255	$	3.66	$	40,248

(1) The aggregate intrinsic values of stock options outstanding, exercisable, vested and expected to vest as of October 3, 2020 were calculated as the difference between the exercise price of the stock options and the fair value of the Class A common stock of $6.92 as of October 3, 2020.

Schedule of restricted stock unit activity

RSU activity under the equity incentive plans was as follows (in thousands, except per share amounts):

	RSUs Outstanding	Weighted- Average Grant Date Fair Value
Unvested balance—December 31, 2019	18,932	$	5.68
Granted	9,904	$	6.41
Vested	(8,808)	$	6.16
Forfeited or canceled	(944)	$	5.90
Unvested balance—October 3, 2020	19,084	$	5.83

Schedule of stock-based compensation expense

Total stock-based compensation expense recognized was as follows (in thousands):

	Three Months Ended				Nine Months Ended
	October 3, 2020		September 28, 2019		October 3, 2020		September 28, 2019
Cost of revenue	$	1,846	$	1,446	$	6,059	$	4,397
Research and development	10,633		10,557		33,194		34,437
Sales and marketing	2,701		2,587		8,376		8,900
General and administrative	3,197		3,494		10,248		11,441
Total stock-based compensation expense	$	18,377	$	18,084	$	57,877	$	59,175