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LEASES - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 14, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 17, 2019	Apr. 04, 2011
Leases
Impairment of operating lease right of use asset				$ 223
Total lease cost			$ 1,912	1,884
New York
Leases
Lease term							7 years
Impairment of operating lease right of use asset		$ 223
Sublease income			$ 1,223	$ 72	$ 0
Singapore
Leases
Lease term						3 years
Period from July 26, 2019 to September 29, 2025 | New York
Leases
Free base rental period of the sublease	4 months 15 days
Period from December 10, 2019 to September 29, 2025 | New York
Leases
Monthly base sublease income	$ 102

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Free base rental period upon commencement of the sublease.

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- 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=77888426&loc=SL77918686-209980

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- Definition

Term of lessee's operating lease, 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 842
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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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.

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No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
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- Definition

Amount of sublease income excluding finance and operating lease expense.

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-Publisher FASB
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-SubTopic 20
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