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RELATED-PARTY TRANSACTIONS - Former Related Party Indemnification Costs (Details) - USD ($) $ in Thousands			12 Months Ended
	Feb. 14, 2018	Apr. 06, 2015	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Expenses from transactions with related parties		$ 263
Special Committee Investigation | Former President And Chief Executive Officer
Related Party Transaction [Line Items]
Expenses from transactions with related parties			$ 3,000	$ 573
Special Committee Investigation | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties			1,400	57
Special Committee Investigation | 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
Special Committee Investigation | Former Director
Related Party Transaction [Line Items]
Expenses from transactions with related parties			$ 509	$ 29
Subsequent Event [Member] | 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%
Subsequent Event [Member] | 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
Subsequent Event [Member] | Settlement Agreement, Reimbursement For Health Care Premiums | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties	38
Subsequent Event [Member] | Settlement Agreement, Attorneys Fees | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 650

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Related Party Transaction, Company Ownership Percentage Maximum Threshold

+ References

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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://www.xbrl.org/2003/role/presentationRef
-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

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