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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

X

- Definition

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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Amount of damages awarded to the plaintiff in the legal matter.

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The total number of new claims filed pertaining to a loss contingency during the period.

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