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Fair value estimates - Transfers Between Levels (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Fair value estimates |  |
Fair value of assets transfers from level 1 to level 2 | $ 0 | $ 0
Fair value of assets transfers from level 2 to level 1 | 0 | 0
Fair value of liabilities transfers from level 1 to level 2 | 0 | 0
Fair value of liabilities transfers from level 2 to level 1 | 0 | 0
Fair value of assets transfers into level 3 | 0 | 0
Fair value of assets transfers out of level 3 | 0 | 0
Fair value of liabilities transfers into level 3 | 0 | 0
Fair value of liabilities transfers out of level 3 | $ 0 | $ 0

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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