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Employee Benefit Plans (Tables)

12 Months Ended

Jan. 01, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Allocated Employee Stock-Based Compensation Expense

We allocated the stock-based compensation expense for our equity incentive plans and our ESPP as follows (in thousands):

			Year Ended December 31,
			2020						2019						2018
Research and development			$	37,198					$	19,374					$	13,115
Selling, general and administrative			67,872						37,228						27,511
Total stock-based compensation expense			$	105,070					$	56,602					$	40,626

			Year Ended December 31,
			2020						2019						2018
Stock options			$	19,863					$	23,422					$	18,896
Restricted stock units			35,675						26,056						19,569
Performance stock units			47,106						4,878						—
ESPP			2,426						2,246						2,161
Total stock-based compensation expense			$	105,070					$	56,602					$	40,626

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

The weighted average grant-date fair value per share of stock options and ESPP purchases were as follows:

			Year Ended December 31,
			2020						2019						2018
Stock options, including PSOs			$	9.44					$	8.19					$	9.07
ESPP			$	6.12					$	4.85					$	6.40

Schedule of Fair Value of Employee Share-Based Payments Awards Stock Option Assumptions and Weighted Average Fair Values

The grant-date fair value of stock option grants, including PSOs, and ESPP purchases was estimated using the following assumptions:

			Year Ended December 31,
			2020						2019						2018
Stock options, including PSOs:
Risk-free interest rate			0.30		%				1.77		%				2.81		%
Dividend yield			—		%				—		%				—		%
Volatility			54		%				48		%				55		%
Expected life			4.4 years						4.3 years						4.4 years
ESPP:
Risk-free interest rate			0.79		%				2.16		%				1.93		%
Dividend yield			—		%				—		%				—		%
Volatility			52		%				50		%				53		%
Expected life			6 months						6 months						6 months

Schedule of Fair Value of Employee Share-Based Payments Awards ESPP Assumptions and Weighted Average Fair Values

The grant-date fair value of stock option grants, including PSOs, and ESPP purchases was estimated using the following assumptions:

			Year Ended December 31,
			2020						2019						2018
Stock options, including PSOs:
Risk-free interest rate			0.30		%				1.77		%				2.81		%
Dividend yield			—		%				—		%				—		%
Volatility			54		%				48		%				55		%
Expected life			4.4 years						4.3 years						4.4 years
ESPP:
Risk-free interest rate			0.79		%				2.16		%				1.93		%
Dividend yield			—		%				—		%				—		%
Volatility			52		%				50		%				53		%
Expected life			6 months						6 months						6 months

Summary of All Stock Option Activity

Activity for stock options, including PSOs, during the year ended December 31, 2020 was as follows (in thousands, except per share amounts):

			Shares						Weighted  Average Exercise Price						Weighted  Average Remaining Contractual Term						Aggregate Intrinsic Value
Stock options outstanding at December 31, 2019			20,443						$	9.91
Granted			1,637						$	21.89
Exercised			(5,633)						$	4.77
Cancelled			(318)						$	20.12
Stock options outstanding at December 31, 2020			16,129						$	12.72					3.1 years						$	131,729
Stock options exercisable at December 31, 2020			12,656						$	10.47					2.5 years						$	128,740

Summary of All RSU Activity

Activity for RSUs during the year ended December 31, 2020 was as follows (in thousands, except per share amounts):

			Shares						Weighted  Average Grant Date Fair Value						Weighted  Average Remaining Contractual  Term						Aggregate Intrinsic Value
RSUs outstanding at December 31, 2019			4,422						$	19.30
Awarded			3,053						$	23.49
Vested and released			(1,699)						$	18.20
Forfeited			(398)						$	20.25
RSUs outstanding at December 31, 2020			5,378						$	21.96					1.9 years						$	107,933

Activity for PSUs, during the year ended December 31, 2020 was as follows (in thousands, except per share amounts):

			Shares						Weighted  Average Grant Date Fair Value						Weighted  Average Remaining Contractual  Term						Aggregate Intrinsic Value
PSUs outstanding at December 31, 2019			4,379						$	19.33
Awarded			4,656						$	23.15
Vested and released			(1,529)						$	19.39
Forfeited			(128)						$	21.09
PSUs outstanding at December 31, 2020			7,378						$	21.70					3.5 years						$	148,076

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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