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Commitments and contingencies - Additional Information (Detail) ¥ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 21, 2017 USD ($) case | Aug. 21, 2017 CNY (¥) case | Jan. 31, 2018 case | Jan. 31, 2015 case | Dec. 31, 2020 USD ($) case | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Apr. 22, 2020 case
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Legal and litigation related expenses | $ |  |  |  |  |  |  | $ 1,955,000 |  | $ 4,667,000 |
Legal expense reversed | $ |  |  |  |  | $ 1,217,000 |  |  |  |  |
Number of lawsuits pending |  |  |  |  | 16 |  |  |  |  |
Aggregate amount of claimed damages | $ |  |  |  |  |  |  | 1,900,000 |  |  |
Legal and litigation related expenses | $ |  |  |  |  | $ 1,640,000 |  | 2,765,000 |  |  |
Copyright Infringement [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Claims filed during the period |  |  |  | 28 |  |  |  |  |  |
Number of video products included in lawsuits |  |  |  | 28 |  |  |  |  |  |
Putative Shareholder Class Action [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Claims filed during the period |  |  | 2 |  |  |  |  |  |  |
Pending Litigation [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of lawsuits pending |  |  |  |  |  |  |  |  |  | 16
Aggregate amount of claimed damages |  |  |  |  | 1,900,000 | ¥ 13.3 | 11,900,000 | ¥ 82.0 |  |
Legal and litigation related expenses | $ |  |  |  |  | $ 1,640,000 |  | $ 2,765,000 |  |  |
Pending Litigation [Member] | Copyright Infringement [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of lawsuits pending |  |  |  |  |  |  |  |  |  | 13
Judicial Ruling [Member] | Copyright Infringement [Member] |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of trial cases after combination of lawsuits by court | 2 | 2 |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 200,000 | ¥ 1.4 |  |  |  |  |  |  |  |

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