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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION - Deferred Costs and Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jan. 01, 2021	Dec. 31, 2020	Jan. 01, 2020
Deferred costs					$ 1,847		$ 2,525
Total deferred costs amortized	$ 85	$ 5,499	$ 3,907	$ 10,895
Deferred revenue	684	1,159	684	1,159	$ 1,779	$ 1,779	$ 3,481
Revenue recognized that was included in deferred revenue balances at beginning of period	0	254	1,779	3,347
Prepaid expenses and other current assets
Deferred costs	$ 92	$ 878	$ 92	$ 878

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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