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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Marketable securities accounted for as available-for-sale securities
Amortized Cost	$ 48,093	$ 173,347
Gross Unrealized Gains	0	101
Gross Unrealized Losses	(35)	(103)
Fair Value	48,058	173,345
Commercial paper
Marketable securities accounted for as available-for-sale securities
Amortized Cost	0	12,919
Gross Unrealized Gains		47
Gross Unrealized Losses		0
Fair Value	0	12,966
Corporate debt securities
Marketable securities accounted for as available-for-sale securities
Amortized Cost	48,093	153,240
Gross Unrealized Gains	0	52
Gross Unrealized Losses	(35)	(103)
Fair Value	48,058	153,189
Government obligations
Marketable securities accounted for as available-for-sale securities
Amortized Cost	0	7,188
Gross Unrealized Gains	0	2
Gross Unrealized Losses	0	0
Fair Value	$ 0	$ 7,190

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- Definition

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

+ References

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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