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Cash and Cash Equivalents and Investments

12 Months Ended

Dec. 31, 2018

Cash and Cash Equivalents and Investments [Abstract]

Cash and Cash Equivalents and Investments

Cash and Cash Equivalents and Investments

The fair value of cash and cash equivalents and investments held at December 31, 2018 and 2017 are as follows:

	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

	As of December 31, 2017
	Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
					(in thousands)
Cash and cash equivalents	$	61,661			$	—			$	—			$	61,661
Securities maturing within one year:
U.S. treasury securities	222,316				—				(168		)		222,148
Corporate debt securities	27,033				—				(54		)		26,979
Total short-term investments	$	249,349			$	—			$	(222	)		$	249,127
Total cash and cash equivalents and investments	$	311,010			$	—			$	(222	)		$	310,788

There were no realized gains or losses for the year ended December 31, 2018. There were $7,000 in realized losses for the year ended December 31, 2017.  There were no realized gains or losses for the year ended December 31, 2016.

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Cash and Cash Equivalents and Investments [Abstract]

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- Definition

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 305
-URI http://asc.fasb.org/topic&trid=2122426

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