Cash and Investments (Tables)

3 Months Ended

Apr. 01, 2017

Investments Debt And Equity Securities [Abstract]

Cash, Cash Equivalents and Available-for-Sale Investments

The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):

	April 1, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	45,559	$	—	$	—		$	45,559
Cash equivalents:
Money market funds		858		—		—			858
Commercial paper and corporate debt securities		1,000		—		—			1,000
Marketable securities:				—		—
U.S. Treasury securities		3,006		—		(1	)		3,005
U.S. Government agency securities		8,710		—		(6	)		8,704
Certificate of deposits		21,500		5		—			21,505
Commercial paper		22,325		—		(2	)		22,323
Corporate debt securities		25,875		—		(6	)		25,869
Asset-backed securities		3,274		—		(1	)		3,273
Total cash, cash equivalents, and marketable securities	$	132,107	$	5	$	(16	)	$	132,096
	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	43,604	$	—	$	—		$	43,604
Cash equivalents:
Money market funds		959		—		—			959
Commercial paper and corporate debt securities		2,499		—		—			2,499
Marketable securities:
U.S. Treasury securities		5,667		—		—			5,667
U.S. Government agency securities		11,412		—		(7	)		11,405
Certificates of deposits		23,000		19		—			23,019
Commercial paper		22,402		—		—			22,402
Corporate debt securities		14,194		—		(6	)		14,188
Municipal securities		756		—		(1	)		755
Asset-backed securities		5,466		—		(3	)		5,463
Total cash, cash equivalents, and marketable securities	$	129,959	$	19	$	(17	)	$	129,961