Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table presents details of share-based compensation expenses by functional line item (in thousands):


	Three Months Ended				Six Months Ended
	July 30,		August 1,		July 30,			August 1,
	2016		2015		2016			2015
Cost of goods sold	$	2,832	$	2,012	$	4,634		$	3,559
Research and development		28,581		27,808		52,977			52,589
Selling and marketing		3,315		2,707		6,257			5,284
General and administrative		2,468		4,147		(2,219	)		8,463

	$	37,196	$	36,674	$	61,649		$	69,895

Weighted Average Assumptions Used to Calculate Fair Value Awards


	Three and Six Months Ended
	July 30,			August 1,
	2016			2015
Employee Stock Purchase Plan:
Estimated fair value	$	—		$	3.78
Volatility		—	%		31	%
Expected term (in years)		—			1.3
Risk-free interest rate		—	%		0.4	%
Dividend yield		—	%		1.7	%

Weighted Average Assumptions Used to Calculate Fair Value Awards

The following weighted average assumptions were used for each respective period to calculate the fair value of each time-based stock option award on the date of grant using the Black-Scholes valuation model:


	Three Months Ended						Six Months Ended
	July 30,			August 1,			July 30,			August 1,
	2016			2015			2016			2015
Time-based Stock Options:
Weighted average fair value	$	2.88		$	3.97		$	2.87		$	3.98
Expected volatility		40	%		34	%		40	%		34	%
Expected term (in years)		5.2			5.4			5.2			5.4
Risk-free interest rate		1.2	%		1.6	%		1.3	%		1.6	%
Expected dividend yield		2.4	%		1.7	%		2.5	%		1.7	%