Cash and Cash Equivalents and Investments

6 Months Ended

Jun. 30, 2019

Cash and Cash Equivalents and Investments [Abstract]

Cash and Cash Equivalents Disclosure

Cash and Cash Equivalents and Investments

The fair value of cash and cash equivalents and investments held at June 30, 2019 and December 31, 2018 are as follows:

	As of June 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	11,106	$	—	$	—		$	11,106
Securities maturing within one year:
U.S. treasury securities	94,785		89		(3		)	94,871
Corporate debt securities	—		—		—			—
Total short-term investments	$	94,785	$	89	$	(3	)	$	94,871
Total cash and cash equivalents and investments	$	105,891	$	89	$	(3	)	$	105,977
	As of December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
			(in thousands)
Cash and cash equivalents	$	80,386	$	—	$	—		$	80,386
Securities maturing within one year:
U.S. treasury securities	73,983		—		(9		)	73,974
Corporate debt securities	5,695		—		(3		)	5,692
Total short-term investments	$	79,678	$	—	$	(12	)	$	79,666
Total cash and cash equivalents and investments	$	160,064	$	—	$	(12	)	$	160,052

There were no realized losses during either of the six months ended June 30, 2019 and 2018, respectively. The cost of securities sold is based on the specific identification method.