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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES - Revenue Recognition (Details) | 12 Months Ended
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Dec. 31, 2018
Minimum |
Deferred Revenue Arrangement [Line Items] |
Revenue performance obligation expected satisfaction period | 1
Maximum |
Deferred Revenue Arrangement [Line Items] |
Revenue performance obligation expected satisfaction period | 2

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- 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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Balance Type: | na
Period Type: | duration

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- Definition Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130554-203045 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |