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Cash and Cash Equivalents and Investments

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016 are as follows:

	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

	As of December 31, 2016
	Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
					(in thousands)
Cash and cash equivalents	$	46,600			$	—			$	—			$	46,600
Securities maturing within one year:
U.S. treasury securities	227,911				1				(107		)		227,805
Corporate debt securities	72,188				1				(90		)		72,099
Total short-term investments	$	300,099			$	2			$	(197	)		$	299,904
Total cash and cash equivalents and investments	$	346,699			$	2			$	(197	)		$	346,504

There were $7,000 in realized losses for the year ended December 31, 2017. There were no realized gains or losses for the years ended December 31, 2016 and 2015.

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- Definition

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 305
-URI http://asc.fasb.org/topic&trid=2122426

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