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Concentrations and Risks (Tables)

12 Months Ended

Dec. 31, 2019

Revenues | Customer risk

Concentration Risk [Line Items]

Summary of concentration of risk

		For the year ended
		December 31,
Revenues		2017		2018		2019
Customer A		11	%	19	%	*
Customer B		11	%	—		—
Customer D		—		—		31	%

* Less than 10%

Accounts receivable | Customer risk

Concentration Risk [Line Items]

Summary of concentration of risk

		As of
		December 31,
Accounts receivable		2018		2019
Customer A		30	%	11	%
Customer D		—		35	%

Costs and expenses | Supplier risk

Concentration Risk [Line Items]

Summary of concentration of risk

		For the year ended
		December 31,
Costs and expenses		2017		2018		2019
Supplier IV		—		—		27	%

Accounts payable | Supplier risk

Concentration Risk [Line Items]

Summary of concentration of risk

		As of
		December 31,
Accounts payable		2018		2019
Supplier I		16	%	*
Supplier IV		—		57	%

* Less than 10%

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