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Stockholders' equity - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Number of shares authorized for repurchase |  |  |  |  | 2,000,000.0
Shares available for repurchase under the plan |  | 1,563,519 |  | 1,686,008 |
Aggregate purchase price | $ 1.6 | $ 1.0 | $ 3.0 |  |
Treasury stock |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |
Stock repurchased and acquired in market transactions |  | 122,489 |  |  |
Aggregate purchase price | $ 1.6 | $ 1.0 | $ 3.0 |  |

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