Cash and Investments (Tables)

9 Months Ended

Sep. 29, 2018

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 29, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	94,419	$	—	$	—		$	94,419
Cash equivalents:
Money market funds		1,684		—		—			1,684
Marketable securities:
Certificates of deposit		14,496		6		—			14,502
Commercial paper		11,185		—		—			11,185
Corporate debt securities		37,038		—		(88	)		36,950
Asset-backed securities		14,224		—		(26	)		14,198
Total cash, cash equivalents, and marketable securities	$	173,046	$	6	$	(114	)	$	172,938
	December 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	34,643	$	—	$	—		$	34,643
Cash equivalents:
Money market funds		256		—		—			256
Marketable securities:
U.S. Government agency securities		1,500		—		(5	)		1,495
Certificates of deposits		14,498		—		(1	)		14,497
Commercial paper		7,952		—		(3	)		7,949
Corporate debt securities		48,073		—		(105	)		47,968
Asset-backed securities		10,240		—		(19	)		10,221
Total cash, cash equivalents, and marketable securities	$	117,162	$	—	$	(133	)	$	117,029