Cash and Investments (Tables)

6 Months Ended

Jun. 29, 2019

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):

	June 29, 2019								December 29, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Market Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	56,134	$	—	$	—	$	56,134	$	108,845	$	—	$	—		$	108,845
Cash equivalents:
Money market funds		10,964		—		—		10,964		113		—		—			113
Commercial paper		24,937		—		—		24,937		1,993		—		—			1,993
Certificates of deposit		2,000		—		—		2,000		—		—		—			—
Marketable securities:
Certificates of deposit		13,003		10		—		13,013		9,500		—		(3	)		9,497
Commercial paper		14,063		3		—		14,066		7,933		—		(1	)		7,932
Corporate debt securities		15,281		20		—		15,301		15,788		—		(58	)		15,730
Asset-backed securities		8,550		17		—		8,567		7,706		—		(24	)		7,682
Total cash, cash equivalents, and marketable securities	$	144,932	$	50	$	—	$	144,982	$	151,878	$	—	$	(86	)	$	151,792