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REVENUE RECOGNITION - Deferred contract acquisition costs (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Prepaid expenses and other current assets
Capitalized Contract Cost [Line Items]
Deferred contract acquisition costs	$ 994	$ 1,009
Other non-current assets
Capitalized Contract Cost [Line Items]
Deferred contract acquisition costs	$ 6,771	$ 5,315
Minimum
Capitalized Contract Cost [Line Items]
Deferred contract acquisition cost recognition period	12 months
Maximum
Capitalized Contract Cost [Line Items]
Deferred contract acquisition cost recognition period	18 months

X

- Definition

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131251-203054

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

The carrying amount of deferred costs.

+ References

No definition available.

+ Details

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