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Recently issued accounting pronouncements - Additional Information (Details) $ in Thousands, $ in Thousands | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jan. 01, 2019 CAD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of 2017-12 |  |  |  | $ 186 |
Right-of-use asset |  |  |  | 8,295 |
Operating lease liabilities | $ 10,388 |  |  | 8,295 |
Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Right-of-use asset |  |  |  | 8,295 |
Operating lease liabilities |  |  | $ 8,295 |  |
Accumulated OCI |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of 2017-12 |  |  |  | 186 |
Accumulated OCI | Accounting Standards Update 2017-12 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of 2017-12 |  |  |  |  | $ 186
Retained Earnings | Accounting Standards Update 2017-12 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of 2017-12 |  | $ (186) |  | $ (186) |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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