Cash and Cash Equivalents and Investments

9 Months Ended

Sep. 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 September 30, 2019 and December 31, 2018 are as follows:

	As of September 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	170,203	$	—	$	—		$	170,203
Securities maturing within one year:
U.S. treasury securities	126,065		44		(8		)	126,101
Total short-term investments	$	126,065	$	44	$	(8	)	$	126,101
Total cash and cash equivalents and investments	$	296,268	$	44	$	(8	)	$	296,304
	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 nine months ended September 30, 2019 and 2018, respectively. The cost of securities sold is based on the specific identification method.