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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | $ (30) |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | (30) |
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 36,502 |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | 36,502 |
Commercial paper |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (6) |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | (6) |
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 18,435 |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | 18,435 |
Corporate debt securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (24) | $ (28)
Securities in an unrealized loss position greater than 12 months | 0 | (2)
Total | (24) | (30)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 18,067 | 59,108
Securities in an unrealized loss position greater than 12 months | 0 | 6,519
Total | $ 18,067 | $ 65,627

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