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Certain risks and concentration - Schedule of Consolidated Financial Information of VIEs and VIE's Subsidiaries - Cash Flow (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net (decrease)/increase in cash, cash equivalents and restricted cash	$ (31,988)	$ 45,788	$ (104,036)
Variable Interest Entity, Primary Beneficiary [Member]
Net cash provided by/ (used in) operating activities	(21,008)	(16,047)	7,548
Net cash used in investing activities	(9,160)	(5,001)	(7,925)
Net cash provided by financing activities	7,154	11,707	2,096
Net (decrease)/increase in cash, cash equivalents and restricted cash	$ (23,014)	$ (9,341)	$ 1,719

X

- Definition

Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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