Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option and RSU Activity Under Plan

The following table summarizes stock option and RSU activity under the 2010 Plan:

	Outstanding Stock Options									Outstanding RSUs
						Weighted-							Weighted-
				Weighted-		Average							Average
				Average		Remaining		*Aggregate					Grant
	Number of			Exercise		Contractual		Intrinsic		Number			Date Fair
	Options			Price		Life (Years)		Value		of RSUs			Value
Balance, December 31, 2015		20,015,180		$	46.14						2,439,674		$	219.90
Assumed through acquisition		1,304,104			283.35						382,611			185.04
Granted		853,960			211.10						2,797,973			202.59
Exercised		(8,735,830	)		12.84						—			—
Cancelled		(561,992	)		218.58						(519,908	)		215.07
Released		—			—						(1,018,261	)		212.96
Balance, December 31, 2016		12,875,422		$	96.50		5.8	$	1.72		4,082,089		$	207.11
Vested and expected to vest, December 31, 2016		12,875,422		$	96.50		5.8	$	1.72		4,082,089
Exercisable and vested, December 31, 2016		7,817,124		$	77.70		5.2	$	1.19		—
*Aggregate intrinsic value in billions

Schedule of Fair Value of Option Award and ESPP on Grant Date

We utilize the fair value method in recognizing stock-based compensation expense. Under the fair value method, we estimated the fair value of each option award and the ESPP on the grant date generally using the Black-Scholes option pricing model and the weighted-average assumptions noted in the following table.

	Year Ended December 31,
	2016			2015			2014
Risk-free interest rate:
Stock options		1.5	%		1.6	%		1.9	%
ESPP		0.6	%		0.3	%		0.1	%
Expected term (in years):
Stock options		6.2			5.4			6.0
ESPP		0.5			0.5			0.5
Expected volatility:
Stock options		47	%		48	%		55	%
ESPP		41	%		42	%		46	%
Dividend yield:
Stock options		0.0	%		0.0	%		0.0	%
ESPP		0.0	%		0.0	%		0.0	%

Summary of Stock-Based Compensation Expense

The following table summarizes the stock-based compensation expense by line item in the consolidated statements of operations (in thousands):

	Year Ended December 31,
	2016		2015		2014
Cost of sales	$	30,400	$	19,244	$	17,454
Research and development		154,632		89,309		62,601
Selling, general and administrative		149,193		89,446		76,441
Total	$	334,225	$	197,999	$	156,496