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Employee Benefit Plans (Tables)

12 Months Ended

Jan. 03, 2020

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,
	2019				2018				2017
Research and development	$	19,374			$	13,115			$	7,569
Selling, general and administrative	37,228				27,511				16,369
Total stock-based compensation	$	56,602			$	40,626			$	23,938

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,
	2019				2018				2017
Stock options, including PSOs	$	8.19			$	9.07			$	11.42
ESPP	$	4.85			$	6.40			$	6.00

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,
	2019			2018			2017
Stock options, including PSOs:
Risk-free interest rate	1.77	%		2.81	%		1.98	%
Dividend yield	—	%		—	%		—	%
Volatility	48	%		55	%		59	%
Expected life	4.3 years			4.4 years			4.5 years
ESPP:
Risk-free interest rate	2.16	%		1.93	%		1.09	%
Dividend yield	—	%		—	%		—	%
Volatility	50	%		53	%		58	%
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,
	2019			2018			2017
Stock options, including PSOs:
Risk-free interest rate	1.77	%		2.81	%		1.98	%
Dividend yield	—	%		—	%		—	%
Volatility	48	%		55	%		59	%
Expected life	4.3 years			4.4 years			4.5 years
ESPP:
Risk-free interest rate	2.16	%		1.93	%		1.09	%
Dividend yield	—	%		—	%		—	%
Volatility	50	%		53	%		58	%
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, 2019 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, 2018	22,674			$	8.71
Granted	1,311			$	20.08
Exercised	(3,274	)		$	5.01
Forfeited	(217	)		$	16.89
Expired	(51	)		$	22.98
Stock options outstanding at December 31, 2019	20,443			$	9.91			3.2 years		$	169,299
Stock options exercisable at December 31, 2019	16,216			$	7.36			2.6 years		$	167,449

Summary of All RSU Activity

Activity for RSUs, including PSUs, during the year ended December 31, 2019 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, 2018	4,857			$	18.42
Awarded	5,842			$	19.46
Vested and released	(1,541	)		$	17.23
Forfeited	(357	)		$	18.66
RSUs outstanding at December 31, 2019	8,801			$	19.31			2.2 years		$	149,701

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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 of the changes in outstanding nonvested restricted stock units.

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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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

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