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Transactions with related parties - Executive - Administrative Services Agreement (Details) € in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 21, 2014 | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 30, 2014 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Eur/US Dollar exchange rate |  | 1.1227 | 1.1227 |  |  |
Administrative services fee |  | $ 120 |  | $ 120 | $ 120 |
Executive services agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Annual executive services fee |  | $ 604 | € 538 |  |  |
Executive services agreement duration | The Executive Services Agreement had an initial term of five years and, on November 18 2018, was automatically renewed for successive five year terms, unless terminated earlier. |  |  |  |  |
Executive Services Agreement - Initial Term |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Executive services agreement duration | 5 years |  |  |  |  |
Executive Services Agreement - Automatic Renewal |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Executive services agreement duration | 5 years |  |  |  |  |
Administrative Services Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Administrative services days termination notice |  | 120 days | 120 days |  |  |
Administrative Services Agreement | Monthly fee |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Administrative services fee |  |  |  |  |  | $ 10

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- Definition Days notice required for termination of administrative services agreement. + References No definition available. + Details
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- Definition Executive services agreement duration. + References No definition available. + Details
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- Definition Period (in years) of executive services agreement. + References No definition available. + Details
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- Definition Amount fee charged by the management company for the provision of executive services. + References No definition available. + Details
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- Definition Amount of expense for administrative services provided to the limited liability company (LLC) or limited partnership (LP) by the managing member or general partner, affiliate of managing member or general partner, or affiliate of LLC or LP, for example, but not limited to, salaries, rent, or overhead costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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