Marketable Securities

9 Months Ended

Sep. 30, 2019

Marketable Securities

Marketable Securities

4. Marketable Securities

The following table summarizes the Company’s investments as of September 30, 2019 (in thousands):

			Gross
	Amortized		Unrealized				Estimated
	Cost		Gains		Losses		Fair Value
Marketable securities available-for-sale:
U.S. Treasury obligations	$	143,415	$	35	$	(9)	$	143,441
Total available-for-sale securities	$	143,415	$	35	$	(9)	$	143,441

The following table summarizes the Company’s investments as of December 31, 2018 (in thousands):

			Gross
	Amortized		Unrealized				Estimated
	Cost		Gains		Losses		Fair Value
Marketable securities available-for-sale:
U.S. Treasury obligations	$	60,584	$	—	$	(8)	$	60,576
Total available-for-sale securities	$	60,584	$	—	$	(8)	$	60,576