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 litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The number of video products included in the multiple lawsuits filed.

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The number of cases entered for trial after the court combined the multiple lawsuits originally filed.

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Represents the rental expense for the reporting period incurred under continuing operations leases, including minimum and any contingent rent expense, net of related sublease income.

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Commitments and contingencies - Additional Information (Detail) ¥ in Millions			1 Months Ended		12 Months Ended
	Aug. 21, 2017 CNY (¥) case	Aug. 21, 2017 USD ($) case	Jan. 31, 2018 case	Jan. 31, 2015 case	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 22, 2020 case
Loss Contingencies [Line Items]
Legal and litigation related expenses \| $						$ 1,955,000		$ 4,667,000	$ 9,453,000
Legal and litigation related expenses \| $						2,765,000		3,846,000
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										24
Aggregate amount of claimed damages					¥ 82.0	11,900,000	¥ 81.2	12,300,000
Legal and litigation related expenses \| $						2,765,000		3,846,000
Pending Litigation [Member] \| Copyright Infringement [Member]
Loss Contingencies [Line Items]
Number of lawsuits pending										20
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	¥ 1.4	$ 200,000
Bandwidth Purchase Commitments [Member]
Loss Contingencies [Line Items]
Total lease expenses for continuing operations \| $						$ 57,093,000		$ 48,118,000	$ 68,441,000