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CONTRACT BALANCES (Tables)

12 Months Ended

Dec. 31, 2020

CONTRACT BALANCES

Schedule of accounts receivable, net

​

​	​	​	​	​
​	​	As of December 31,
​		2019		2020
​	​	​	​	​
Accounts receivable		881,177		1,482,498
Less: allowance for doubtful accounts		(133)		(2,163)
Accounts receivable, net		881,044		1,480,335
​	​	​	​	​
Including:	​	​	​	​
- Current portion	​	879,962	​	1,480,335
- Non-current portion	​	1,082	​	—

​

Schedule of allowance for doubtful accounts

​

​	​	​	​	​	​	​
​	​	Years ended December 31,
​		2018		2019		2020
​	​	​	​	​	​	​
Balance at the beginning of the year		—		241	​	133
Allowance made during the year		241		274	​	2,032
Write-off during the year	​	—	​	(382)	​	—
Foreign exchange impact	​	—	​	—	​	(2)
Balance at the end of the year		241		133	​	2,163

​

Schedule of deferred revenue

​

​	​	​
​		Deferred revenue
​	​	​
Beginning balance as of January 1, 2020		105,735
Increase		5,804
​	​	​
Closing balance as of December 31, 2020		111,539

​

X

- Definition

Tabular disclosure of allowance for credit loss on financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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- References

No definition available.

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- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

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- Definition

Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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