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CONCENTRATION AND RISK (Tables)

12 Months Ended

Dec. 31, 2021

CONCENTRATION AND RISK

Schedule of Revenues of Major Customers

The following customers individually accounted for 10% or more of revenues:

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2019			2020			2021
Customer A		$	187,217	​	$	369,333	​	$	532,129	​
Customer B	​	​	*	​	​	67,431	​	​	230,088	​
Customer D	​	​	*	​	​	*	​	​	268,466	​
Customer E	​	$	84,226	​	$	126,759	​	$	225,899	​

*Represents less than 10%

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- Definition

Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer.

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