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Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair value measurements [Abstract]

Schedule of Financial Instruments Measured at Fair Value

		Fair value measurements as at December 31, 2016
(In thousands)		Total			Quoted prices in active market for identical assets (Level 1)			Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
Cash equivalents: time deposits with original maturities less than three months			115,944			—			115,944			—
Short term investments:
Investments in financial instruments			143,131			—			143,131			—
			259,075			—			259,075			—

		Fair value measurements as at December 31, 2017
(In thousands)		Total			Quoted prices in active market for identical assets (Level 1)			Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
Cash equivalents: time deposits with original maturities less than three months			115,534			—			115,534			—
Short term investments:
Investments in financial instruments			138,915			—			138,915			—
			254,449			—			254,449			—

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- References

No definition available.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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