Fair Value Measurements (Tables)

9 Months Ended

Oct. 02, 2016

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured On Recurring Basis

	As of October 2, 2016
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents—money-market funds	$	10,325	$	10,325	$	—	$	—
Available-for-sale securities—U.S. treasuries (1)	127,689		127,689		—		—
Available-for-sale securities—certificates of deposit (1)	156		156		—		—
Trading securities—mutual funds (1)	1,451		1,451		—		—
Foreign currency forward contracts (2)	1,053		—		1,053		—
Total assets measured at fair value	$	140,674	$	139,621	$	1,053	$	—

(1) Included in short-term investments on the Company’s unaudited condensed consolidated balance sheet.

(2) Included in prepaid expenses and other current assets on the Company’s unaudited condensed consolidated balance sheet.

	As of December 31, 2015
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents—money-market funds	$	10,976	$	10,976	$	—	$	—
Available-for-sale securities—U.S. treasuries (1)	94,993		94,993		—		—
Available-for-sale securities—certificates of deposit (1)	147		147		—		—
Trading securities—mutual funds (1)	1,181		1,181		—		—
Foreign currency forward contracts (2)	3,205		—		3,205		—
Total assets measured at fair value	$	110,502	$	107,297	$	3,205	$	—

(1) Included in short-term investments on the Company’s unaudited condensed consolidated balance sheet.

(2) Included in prepaid expenses and other current assets on the Company’s unaudited condensed consolidated balance sheet.

Fair Value, Liabilities Measured On Recurring Basis

	As of December 31, 2015
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Foreign currency forward contracts (3)	$	451	$	—	$	451	$	—
Total liabilities measured at fair value	$	451	$	—	$	451	$	—

(3) Included in other accrued liabilities on the Company’s unaudited condensed consolidated balance sheet.

	As of October 2, 2016
	Total		Quoted market prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Foreign currency forward contracts (3)	$	1,285	$	—	$	1,285	$	—
Total liabilities measured at fair value	$	1,285	$	—	$	1,285	$	—

(3) Included in other accrued liabilities on the Company’s unaudited condensed consolidated balance sheet.