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Fair Value Measurements and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Summary of Cash Equivalents and Marketable Securities

The following tables summarize the Company’s cash equivalents and marketable securities as of June 30, 2018 and December 31, 2017:

		June 30, 2018
		Total				Quoted Prices in Active Markets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
		(in thousands)
Cash equivalents:
Money market funds		$	22,971			$	22,971			$	—			$	—
Commercial paper			10,732				—				10,732				—
U.S. government securities			1,698				—				1,698				—
Corporate bonds			850				—				850				—
Total cash equivalents			36,251				22,971				13,280				—
Marketable securities:
Corporate bonds			12,121				—				12,121				—
Commercial paper			21,000				—				21,000				—
U.S. government securities			1,983				—				1,983				—
Total marketable securities			35,104				—				35,104				—
Total cash equivalents and marketable securities		$	71,355			$	22,971			$	48,384			$	—

		December 31, 2017
		Total				Quoted Prices in Active Markets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
		(in thousands)
Cash equivalents:
Money market funds		$	15,802			$	15,802			$	—			$	—
Commercial paper			998				—				998				—
Corporate bonds			549				—				549				—
Total cash equivalents			17,349				15,802				1,547				—
Marketable securities:
Corporate bonds			50,844				—				50,844				—
Commercial paper			9,951				—				9,951				—
Certificates of deposit			480				—				480				—
Total marketable securities			61,275				—				61,275				—
Total cash equivalents and marketable securities		$	78,624			$	15,802			$	62,822			$	—

Summary of Marketable Securities

Marketable Securities

The following tables summarize the Company’s marketable securities as of June 30, 2018 and December 31, 2017:

		June 30, 2018
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(in thousands)
Assets:
Corporate bonds (due within 1 year)		$	12,126			$	—			$	(5	)		$	12,121
Commercial paper (due within 1 year)			21,001				—				(1	)			21,000
U.S. government securities (due within 1 year)			1,983				—				—				1,983
		$	35,110			$	—			$	(6	)		$	35,104

		December 31, 2017
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
		(in thousands)
Assets:
Corporate bonds (due within 1 year)		$	50,892			$	—			$	(48	)		$	50,844
Commercial paper (due within 1 year)			9,961				—				(10	)			9,951
Certificates of deposit (due within 1 year)			480				—				—				480
		$	61,333			$	—			$	(58	)		$	61,275

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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- Definition

Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

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