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FINANCIAL STATEMENT PRESENTATION (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) segment | Dec. 31, 2017 USD ($)
Basis of Presentation and Principles of Consolidation |  |
Number of operating segments | segment | 1 |
Allowance for doubtful accounts | $ | $ 0.1 | $ 0.7

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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