REVENUE RECOGNITION - Narrative (Details)	12 Months Ended
Dec. 31, 2019 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract asset impairment charges	$ 0
Safe harbor payment	49,909,000
Revenue expected to be recognized from safe harbor prepayments	44,500,000
Envoy Communications Gateway
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue expected to be recognized from safe harbor prepayments	5,400,000
Letter of credit
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Line of credit	44,700,000
Collateralized letter of credit	$ 44,700,000

Contract With Customer, Increase Due To Safe Harbor Prepayments

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Revenue, Remaining Performance Obligation, Amount, Safe Harbor Prepayments For Product Delivery In Next Fiscal Quarter

+ References

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- Definition

Amount of impairment loss 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 current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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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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