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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Marketable securities accounted for as available-for-sale securities
Amortized Cost	$ 148,497,000	$ 173,347,000
Gross Unrealized Gains	58,000	101,000
Gross Unrealized Losses	(84,000)	(103,000)
Fair Value	148,471,000	173,345,000
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	19,162,000	12,919,000
Gross Unrealized Gains	35,000	47,000
Gross Unrealized Losses	0	0
Fair Value	19,197,000	12,966,000
Corporate debt securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	126,134,000	153,240,000
Gross Unrealized Gains	23,000	52,000
Gross Unrealized Losses	(84,000)	(103,000)
Fair Value	126,073,000	153,189,000
Government obligations
Marketable securities accounted for as available-for-sale securities
Amortized Cost	3,201,000	7,188,000
Gross Unrealized Gains	0	2,000
Gross Unrealized Losses	0	0
Fair Value	$ 3,201,000	$ 7,190,000

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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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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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