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Stockholders' equity - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2010
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Number of shares authorized for repurchase |  |  | 2,000,000
Shares available for repurchase under the plan | 1,840,697 | 1,951,000 |
Aggregate purchase price | $ 1.4 |  |
Common stock |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stock repurchased and acquired in market transactions | 110,303 |  |
Aggregate purchase price | $ 1.4 |  |

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