Available-for-sale Securities (Tables)

9 Months Ended

Sep. 30, 2016

Investments Debt And Equity Securities [Abstract]

Summary of Available-for-Sale Securities

The following is a summary of available-for-sale securities at September 30, 2016 (in thousands):

	September 30, 2016
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Money market funds	$	2,122	$	-	$	-		$	2,122
United States government agency securities		25,190		4		-			25,194
Corporate debt securities		43,198		19		(17	)		43,200
Marketable equity securities		-		4,930		-			4,930
Total available-for-sale securities	$	70,510	$	4,953	$	(17	)	$	75,446

The following is a summary of available-for-sale securities at December 31, 2015 (in thousands):

	December 31, 2015
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Money market funds	$	59,302	$	-	$	-		$	59,302
Corporate debt securities		25,747		-		(49	)		25,698
Marketable equity securities		-		11,163		-			11,163
Total available-for-sale securities	$	85,049	$	11,163	$	(49	)	$	96,163

Available-for-Sale Debt Securities by Original Contractual Maturity

Available-for-sale securities at September 30, 2016 and December 31, 2015, consisted of the following by contractual maturity (in thousands):

	September 30, 2016				December 31, 2015
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
One year or less	$	66,507	$	66,512	$	85,049	$	85,000
Marketable equity securities		-		4,930		-		11,163
Greater than one year and less than five years		4,003		4,004		-		-
Total available-for-sale securities	$	70,510	$	75,446	$	85,049	$	96,163

Available-for-Sale Marketable Securities in Unrealized Position

The following tables show all available-for-sale marketable securities in an unrealized loss position for which an other-than-temporary impairment has not been recognized and the related gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):

	September 30, 2016
	Less than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Corporate debt securities	$	20,082	$	(17	)	$	-	$	-	$	20,082	$	(17	)
Total available-for-sale securities	$	20,082	$	(17	)	$	-	$	-	$	20,082	$	(17	)

	December 31, 2015
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Corporate debt securities	$	20,170	$	(46	)	$	5,528	$	(3	)	$	25,698	$	(49	)
Total available-for-sale securities	$	20,170	$	(46	)	$	5,528	$	(3	)	$	25,698	$	(49	)