Marketable Securities

6 Months Ended

Jun. 30, 2019

Marketable securities as of June 30, 2019 and December 31, 2018 consisted of the following:



June 30, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	50,057	$	—	$	—	$	50,057
Total marketable securities designated as available-for-sale	$	50,057	$	—	$	—	$	50,057



December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	25	$	—	$	—	$	25
Total marketable securities designated as available-for-sale	$	25	$	—	$	—	$	25

The amortized costs and fair value of marketable securities as of June 30, 2019 and December 31, 2018 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.



June 30, 2019	Amortized Cost		Fair Value
Due in less than one year	$	—	$	—
December 31, 2018	Amortized Cost		Fair Value
Due in less than one year	$	—	$	—

Interest income from marketable securities was $32 and $3 during the three months ended June 30, 2019 and 2018, respectively, and $32 and $15 during the six months ended June 30, 2019 and 2018, respectively.