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RELATED-PARTY TRANSACTIONS - Former Related Party Indemnification Costs and Settlement Agreement (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Feb. 14, 2018	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Special Committee Investigation Indemnification | Former President And Chief Executive Officer
Related Party Transaction [Line Items]
Expenses from transactions with related parties		$ 2,200	$ 8,500	$ 3,000
Special Committee Investigation Indemnification | Former Management Vice Chair
Related Party Transaction [Line Items]
Expenses from transactions with related parties		0	497	1,400
Special Committee Investigation Indemnification | Former Interim Chief Financial Officer and Chief Strategy Officer
Related Party Transaction [Line Items]
Expenses from transactions with related parties		555
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
Related Party Transaction [Line Items]
Expenses from transactions with related parties		0	292
Special Committee Investigation Indemnification | Former Director | Jeffrey Karish
Related Party Transaction [Line Items]
Expenses from transactions with related parties		$ 0	854
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			$ 400	$ 631
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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Related Party Transaction, Company Ownership Percentage Maximum Threshold

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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

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