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LEASES - Lease Expense Income Statement Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Lease expense, net	$ 4,556	$ 1,312	$ 3,902
Operating lease impairment charges			2,100
Cost of revenue
Lessee, Lease, Description [Line Items]
Lease expense, net	304	31	52
Research and development expense
Lessee, Lease, Description [Line Items]
Lease expense, net	1,984	446	413
Sales and marketing expense
Lessee, Lease, Description [Line Items]
Lease expense, net	1,163	187	173
General and administrative expense
Lessee, Lease, Description [Line Items]
Lease expense, net	$ 1,105	$ 648	$ 3,264

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

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- Definition

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+ References

No definition available.

+ Details

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X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957

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