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Fair value of financial instruments and marketable securities - Marketable securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 144,875 | $ 58,088
Total Marketable securities, More Than 12 Months | 61,143 | 0
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 78,078 | 31,699
Total Marketable securities, More Than 12 Months | 0 | 0
Corporate debt securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 55,621 | 26,389
Total Marketable securities, More Than 12 Months | 59,212 | $ 0
Asset-backed securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 11,176 |
Total Marketable securities, More Than 12 Months | $ 1,931 |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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