Cash, Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 24, 2016

Cash and Cash Equivalents [Abstract]

Summary of cash and cash equivalents

Cash, cash equivalents and marketable securities consisted of the following (in thousands):

	September 24, 2016		December 31, 2015
Cash and cash equivalents:
Cash	$	17,708	$	13,378
Money market funds	14,056		10,248
Total cash and cash equivalents	31,764		23,626
Marketable securities:
Corporate debt securities	23,051		35,799
U.S. government agency securities	6,503		10,520
Commercial paper	—		3,645
Total marketable securities	29,554		49,964
Total cash, cash equivalents and marketable securities	$	61,318	$	73,590

Amortized cost and fair value of marketable securities

As of September 24, 2016, the amortized cost and fair value of marketable securities were as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate debt securities	$	23,050	$	4	$	(3	)	$	23,051
U.S. government agency securities	6,501		2		—			6,503
Total marketable securities	$	29,551	$	6	$	(3	)	$	29,554

As of December 31, 2015, the amortized cost and fair value of marketable securities were as follows (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate debt securities	$	35,869	$	2	$	(72	)	$	35,799
U.S. government agency securities	10,544		—		(24		)	10,520
Commercial paper	3,645		—		—			3,645
Total marketable securities	$	50,058	$	2	$	(96	)	$	49,964

Amortized cost and fair value of marketable securities by contractual maturity

As of September 24, 2016, the amortized cost and fair value of marketable securities by contractual maturity were as follows (in thousands):

	Amortized Cost		Fair Value
Due in 1 year or less	$	29,551	$	29,554