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RELATED-PARTY TRANSACTIONS - Former Related Party Indemnification Costs and Settlement Agreement (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 14, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Special Committee Investigation Indemnification | Former President And Chief Executive Officer |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  | $ 2,000 | $ 3,000 | $ 573
Special Committee Investigation Indemnification | Former Management Vice Chair |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  | 135 | 1,400 |
Special Committee Investigation Indemnification | Former Director |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  |  | 509 |
Special Committee Investigation Indemnification | Former Director | Cynthia Abercrombie [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  | 287 |  |
Special Committee Investigation Indemnification | Former Director | Jeffrey Karish [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  | $ 272 |  |
Special Committee Investigation Indemnification | Former Interim Chief Financial Officer and Chief Strategy Officer and Former Chief Financial Officer |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties |  |  | $ 631 | $ 135
Termination Of Employment Settlement Agreement | Former Management Vice Chair |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties | $ 4,300 |  |  |
Company ownership percentage maximum threshold | 4.99% |  |  |
Termination Of Employment Settlement Agreement, Cash Proceeds From Unvested Stock Options And Restricted Stock Awards | Former Management Vice Chair |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties | $ 576 |  |  |
Termination Of Employment Settlement Agreement, Reimbursement For Health Care Premiums | Former Management Vice Chair |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties | 38 |  |  |
Termination Of Employment Settlement Agreement, Attorneys Fees | Former Management Vice Chair |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related parties | $ 650 |  |  |

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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