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Cash And Cash Equivalents And Investments (Tables)

12 Months Ended

Dec. 31, 2017

Cash And Cash Equivalents And Investments [Abstract]

Summary Of Cash, Cash Equivalents And Investments



	As of December 31, 2017
				Gross			Gross
	Amortized			unrealized			unrealized			Fair
	Cost			gains			losses			Value
Cash and cash equivalents:
Cash and money market funds	$	14,858		$	—		$	—		$	14,858
Commercial paper		1,649			—			—			1,649
Total cash and cash equivalents		16,507			—			—			16,507
Investments:
Commercial paper		20,408			—			(14)			20,394
Corporate debt securities		9,043			—			(9)			9,034
Asset backed securities		—			—			—			—
US government & agency securities		16,946			—			(9)			16,937
Total investments		46,397			—			(32)			46,365
Total cash, cash equivalents and investments	$	62,904		$	—		$	(32)		$	62,872

Long-term restricted cash:
Cash	$	4,500		$	—		$	—		$	4,500

	As of December 31, 2016
				Gross			Gross
	Amortized			unrealized			unrealized			Fair
	Cost			gains			losses			Value
Cash and cash equivalents:
Cash and money market funds	$	14,516		$	—		$	—		$	14,516
Commercial paper		2,249			—			—			2,249
Total cash and cash equivalents		16,765			—			—			16,765
Investments:
Commercial paper		23,581			5			(3)			23,583
Corporate debt securities		10,741			1			(3)			10,739
Asset backed securities		312			—			—			312
US government & agency securities		20,574			7			(2)			20,579
Total investments		55,208			13			(8)			55,213
Total cash, cash equivalents and investments	$	71,973		$	13		$	(8)		$	71,978

Long-term restricted cash:
Cash	$	4,500		$	—		$	—		$	4,500





Summary Of Contractual Maturities Of Cash Equivalents And Available-For-Sale Investments



(in thousands)	Fair Value
Due in one year or less	$	48,014



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Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2,12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Tabular disclosure of the components of cash, cash equivalents, and investments.

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