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Cash and Cash Equivalents and Investments

3 Months Ended

Mar. 31, 2018

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, 2018 and December 31, 2017 are as follows:

		As of March 31, 2018
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
		(in thousands)
Cash and cash equivalents		$	20,421			$	—			$	—			$	20,421
Securities maturing within one year:
U.S. treasury securities		214,302				—				(317		)		213,985
Corporate debt securities		27,943				—				(77		)		27,866
Total short-term investments		$	242,245			$	—			$	(394	)		$	241,851
Total cash and cash equivalents and investments		$	262,666			$	—			$	(394	)		$	262,272
		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 losses for the three months ended March 31, 2018, and $7,000 in realized losses for the three months ended March 31, 2017. The cost of securities sold is based on the specific identification method.

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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://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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