Available-for-Sale-Securities

3 Months Ended

Mar. 31, 2018

Available-for-sale Securities [Abstract]

Available-for-Sale Securities

Available-for-Sale-Securities

The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):

	March 31, 2018									December 31, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate debt securities	$	35,330	$	—	$	(55	)	$	35,275	$	42,701	$	—	$	(28	)	$	42,673
Money market funds	6,996		—		—			6,996		9,212		—		—			9,212
Total	$	42,326	$	—	$	(55	)	$	42,271	$	51,913	$	—	$	(28	)	$	51,885

Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale debt securities on our Consolidated Balance Sheets (in thousands):

	March 31, 2018		December 31, 2017
Cash and cash equivalents	$	15,287	$	25,968
Marketable securities	26,984		25,917
Total	$	42,271	$	51,885

The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):

	March 31, 2018
	Amortized Cost		Estimated Fair Value
Less than one year	$	42,326	$	42,271
Greater than one year	—		—
Total	$	42,326	$	42,271