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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | $ (4) | $ (8)
Securities in an unrealized loss position greater than 12 months | 0 | (3)
Total | (4) | (11)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 3,017 | 16,223
Securities in an unrealized loss position greater than 12 months | 0 | 10,087
Total | 3,017 | 26,310
Commercial paper |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months |  | (1)
Securities in an unrealized loss position greater than 12 months |  | 0
Total |  | (1)
Fair Value |  |
Securities in an unrealized loss position less than 12 months |  | 1,993
Securities in an unrealized loss position greater than 12 months |  | 0
Total |  | 1,993
Corporate debt securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (4) | (7)
Securities in an unrealized loss position greater than 12 months | 0 | (3)
Total | (4) | (10)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 3,017 | 14,230
Securities in an unrealized loss position greater than 12 months | 0 | 10,087
Total | $ 3,017 | $ 24,317

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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