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RELATED-PARTY TRANSACTIONS - Legion Affiliates (Details)		9 Months Ended
	Mar. 13, 2017 USD ($) director	Sep. 30, 2018	Apr. 26, 2018 shares	May 19, 2017 shares
Greater Than 5% Shareholder, Legion Partners Asset Management, LLC
Related Party Transaction [Line Items]
Ownership percentage			4.80%	5.60%
Number of additional independent directors | director	2
Reimbursable expense threshold | $	$ 100,000
Greater Than 5% Shareholder, Legion Partners Asset Management, LLC | Voting Common Stock
Related Party Transaction [Line Items]
Common stock, shares outstanding (in shares) | shares			2,439,751	2,938,679
Company ownership percentage maximum threshold	10.00%
Director | Bonnie G. Hill
Related Party Transaction [Line Items]
Service term		1 year

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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