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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Marketable securities accounted for as available-for-sale securities
Amortized Cost	$ 197,990,000	$ 281,492,000
Gross Unrealized Gains	171,000	83,000
Gross Unrealized Losses	(109,000)	(672,000)
Fair Value	198,052,000	280,903,000
Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy	0	0
Commercial paper
Marketable securities accounted for as available-for-sale securities
Amortized Cost	17,935,000	26,877,000
Gross Unrealized Gains	53,000	80,000
Gross Unrealized Losses	0	0
Fair Value	17,988,000	26,957,000
Corporate debt securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	166,119,000	226,959,000
Gross Unrealized Gains	110,000	0
Gross Unrealized Losses	(109,000)	(640,000)
Fair Value	166,120,000	226,319,000
Government obligations
Marketable securities accounted for as available-for-sale securities
Amortized Cost	13,936,000	27,656,000
Gross Unrealized Gains	8,000	3,000
Gross Unrealized Losses	0	(32,000)
Fair Value	$ 13,944,000	$ 27,627,000

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Amount of transfers of assets measured on a recurring basis between Level 1 and Level 2 of the fair value hierarchy.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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