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v3.19.3.a.u2

Significant accounting policies - Leases (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Nov. 01, 2019 | Oct. 01, 2019 | Jun. 30, 2019 | Jan. 01, 2019
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Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |
Year 1 | $ 2,115 |  |  |  |
Year 2 | 1,138 |  |  |  |
Year 3 | 688 |  |  |  |
Year 4 | 659 |  |  |  |
Year 5 | 642 |  |  |  |
Thereafter | 5,195 |  |  |  |
Total | 10,437 |  |  |  |
Finance Lease, Liability, Payment, Due [Abstract] |  |  |  |  |
Year 1 | 539 |  |  |  |
Year 2 | 537 |  |  |  |
Year 3 | 537 |  |  |  |
Year 4 | 537 |  |  |  |
Year 5 | 537 |  |  |  |
Thereafter | $ 318 |  |  |  |
Weighted-average discount rate, finance lease (percent) | 6.45% |  |  |  |
Weighted-average remaining term, finance lease | 5 years 6 months 18 days |  |  |  |
Right of use asset |  | $ 1,316 |  |  | $ 8,295
Lease liabilities (note 1(q)) | $ 9,695 |  | $ 1,316 |  | $ 8,295
Weighted-average discount rate, operating lease (percent) | 3.95% |  |  |  |
Weighted-average remaining term, operating lease | 13 years 5 months 26 days |  |  |  |
Minimum |  |  |  |  |
Finance Lease, Liability, Payment, Due [Abstract] |  |  |  |  |
Lease renewal term |  |  |  | 1 year |
Maximum |  |  |  |  |
Finance Lease, Liability, Payment, Due [Abstract] |  |  |  |  |
Lease renewal term | 5 years |  |  | 5 years |

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