Cash and Investments (Tables)

6 Months Ended

Jul. 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):

	July 1, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	33,987	$	—	$	—		$	33,987
Cash equivalents:
Money market funds		5,371		—		—			5,371
Commercial paper and corporate debt securities		2,996		—		—			2,996
Marketable securities:				—		—
U.S. Treasury securities		3,004		—		(2	)		3,002
U.S. Government agency securities		2,750		—		(5	)		2,745
Certificate of deposits		26,298		10		—			26,308
Commercial paper		17,427		—		(3	)		17,424
Corporate debt securities		38,035		—		(23	)		38,012
Asset-backed securities		5,850		—		(1	)		5,849
Total cash, cash equivalents, and marketable securities	$	135,718	$	10	$	(34	)	$	135,694
	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