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Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Assets measured at fair value on a recurring basis

The Company’s assets that are measured at fair value on a recurring basis within the fair value hierarchy are summarized as follows:

	September 30, 2016												December 31, 2015
(in thousands)	Level 1				Level 2				Total				Level 1				Level 2				Total
Cash equivalents (1):
Money market funds	$	4,954			$	—			$	4,954			$	51,059			$	—			$	51,059
Total cash equivalents	$	4,954			$	—			$	4,954			$	51,059			$	—			$	51,059
Marketable securities:
U.S. agency securities	$	—			$	13,334			$	13,334			$	—			$	14,451			$	14,451
Commercial paper	—				—				—				—				2,197				2,197
Corporate debt securities	—				77,621				77,621				—				165,825				165,825
Municipal securities	—				2,360				2,360				—				11,913				11,913
Total marketable securities	$	—			$	93,315			$	93,315			$	—			$	194,386			$	194,386

⁽¹⁾ Included in “cash and cash equivalents” in the accompanying condensed consolidated balance sheets. Cash balances were $126.6 million and $228.6 million as of September 30, 2016 and December 31, 2015, respectively.

Available-for-sale Securities

The remaining contractual maturities of available-for-sale marketable securities are as follows:

(in thousands)	September 30, 2016				December 31, 2015
Less than one year	$	93,315			$	122,199
Greater than one year but less than two years	—				72,187
Total	$	93,315			$	194,386

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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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
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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-Publisher FASB
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