Cash and Cash Equivalents and Investments

3 Months Ended

Mar. 31, 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 March 31, 2019 and December 31, 2018 are as follows:

	As of March 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	45,778	$	—	$	—		$	45,778
Securities maturing within one year:
U.S. treasury securities	87,334		35		(2		)	87,367
Corporate debt securities	—		—		—			—
Total short-term investments	$	87,334	$	35	$	(2	)	$	87,367
Total cash and cash equivalents and investments	$	133,112	$	35	$	(2	)	$	133,145
	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 three months ended March 31, 2019 and 2018, respectively. The cost of securities sold is based on the specific identification method.