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Summary of significant accounting policies - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease, right-of-use asset | $ 10,271 |  |
Operating lease liability | 11,831 |  |
Deferred revenue | 646 |  | $ 444
Unbilled revenue in accounts receivable | $ 23,740 |  | $ 25,545
ASC 842 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease, right-of-use asset |  | $ 10,866 |
Operating lease liability |  | $ 11,138 |

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