Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at December 31, 2015 and 2014 were as follows:

			Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
December 31, 2015
	Available-for-sale securities:
		Corporate bonds and notes	$	20,827	$	50	$	(133	)	$	20,744
		Municipal bonds	5,608		18		(5		)	5,621
	Total available-for-sale securities		$	26,435	$	68	$	(138	)	$	26,365

			Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses			Estimated fair value
December 31, 2014
	Available-for-sale securities:
		Corporate bonds and notes	$	19,804	$	89	$	(55	)	$	19,838
		Municipal bonds	6,292		28		(2		)	6,318
	Total available-for-sale securities		$	26,096	$	117	$	(57	)	$	26,156

Marketable Securities

Maturities of marketable securities classified as available-for-sale securities were as follows at December 31, 2015:

		Amortized cost		Estimated fair value
	Due within one year	$	7,179	$	7,161
	Due after one year through five years	19,256		19,204
	Due after five years through ten years	—		—
Total available-for-sale securities		$	26,435	$	26,365

Available-for-sale Marketable Securities

The available-for-sale marketable securities in a gross unrealized loss position as of December 31, 2015 are summarized as follows:

	Less than 12 months					More than 12 months					Total
	Estimated fair value		Gross unrealized holding losses			Estimated fair value		Gross unrealized holding losses			Estimated fair value		Gross unrealized holding losses
As of December 31, 2015
Corporate bonds and notes	$	10,256	$	(88	)	$	3,298	$	(45	)	$	13,554	$	(133	)
Municipal bonds	1,674		(4		)	640		(1		)	2,314		(5		)
	$	11,930	$	(92	)	$	3,938	$	(46	)	$	15,868	$	(138	)