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Fair value (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities that are measured at fair value on a recurring basis

The following tables summarize our assets that are measured at fair value as of June 30, 2018 and December 31, 2017 (in thousands):

Description		Balance as of June 30, 2018				Level 1				Level 2				Level 3
Assets:
Cash and money market funds		$	24,601			$	24,601			$	—			$	—
Corporate debt securities (including commercial paper)		21,046				—				21,046				—
U.S. government securities		7,981				—				7,981				—
Total		$	53,628			$	24,601			$	29,027			$	—

Description		Balance as of December 31,  2017				Level 1				Level 2				Level 3
Assets:
Cash and money market funds		$	15,703			$	15,703			$	—			$	—
Corporate debt securities (including commercial paper)		35,531				—				35,531				—
U.S. government securities		15,969				—				15,969				—
Total		$	67,203			$	15,703			$	51,500			$	—

The following tables summarize our assets that are measured at fair value as of December 31, 2017 and 2016 (in thousands):

Description	Balance as of December 31, 2017				Level 1				Level 2				Level 3
Assets:
Cash and money market funds	$	15,703			$	15,703			$	—			$	—
Corporate debt securities (including commercial paper)	35,531				—				35,531				—
U.S. government securities	15,969				—				15,969				—
Total assets	$	67,203			$	15,703			$	51,500			$	—

Description	Balance as of December 31, 2016				Level 1				Level 2				Level 3
Assets:
Cash and money market funds	$	43,930			$	43,930			$	—			$	—
Corporate debt securities (including commercial paper)	48,466				—				48,466				—
U.S. government securities	21,992				—				21,992				—
Total assets	$	114,388			$	43,930			$	70,458			$	—

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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X

- References

No definition available.

+ Details

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