Cash and Investments (Tables)

9 Months Ended

Sep. 28, 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):

	September 28, 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	$	34,862	$	—	$	—		$	34,862	$	108,845	$	—	$	—		$	108,845
Cash equivalents:
Money market funds		9,162		—		—			9,162		113		—		—			113
Commercial paper		5,985		—		—			5,985		1,993		—		—			1,993
Certificates of deposit		1,000		—		—			1,000		—		—		—			—
Marketable securities:
Certificates of deposit		29,003		4		—			29,007		9,500		—		(3	)		9,497
Commercial paper		16,760		—		(1	)		16,759		7,933		—		(1	)		7,932
Corporate debt securities		36,894		33		—			36,927		15,788		—		(58	)		15,730
Asset-backed securities		10,393		15		—			10,408		7,706		—		(24	)		7,682
Total cash, cash equivalents, and marketable securities	$	144,059	$	52	$	(1	)	$	144,110	$	151,878	$	—	$	(86	)	$	151,792