Marketable Securities

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

Marketable Securities

Marketable securities consisted of the following as of December 31, 2016 and 2015:

December 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	21,848	$	—	$	—	$	21,848
Certificates of deposit	3,864		—		—		3,864
Total marketable securities designated as available-for-sale	$	25,712	$	—	$	—	$	25,712

December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	13,244	$	—	$	—	$	13,244
United States treasuries	1,002		—		—		1,002
Corporate notes	2,283		1		—		2,284
Certificates of deposit	6,089		—		—		6,089
Total marketable securities designated as available-for-sale	$	22,618	$	1	$	—	$	22,619

The amortized costs and fair value of debt securities as of December 31, 2016 and 2015 are shown below by effective maturity. Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.

December 31, 2016	Amortized Cost		Fair Value
Due in less than one year	$	3,864	$	3,864
Due after one year and within two years	—		—
	$	3,864	$	3,864
December 31, 2015	Amortized Cost		Fair Value
Due in less than one year	$	5,515	$	5,516
Due after one year and within two years	3,859		3,859
	$	9,374	$	9,375

Interest income from cash equivalents and marketable securities was $94 and $110 for the years ended December 31, 2016 and 2015, respectively.