STOCKHOLDERS' DEFICIT - Second Quarter 2017 Private Placement (Details) - USD ($) $ / shares in Units, $ in Thousands			6 Months Ended
	Jun. 29, 2017	Mar. 01, 2017	Jun. 30, 2017	Jun. 30, 2016
Class of Stock [Line Items]
Net proceeds from issuance of equity, net of issuance costs			$ 20,776	$ 83,267
Private Placement | Common Stock
Class of Stock [Line Items]
Stock issued (in shares)	6,359,350	3,300,000.0
Stock offering price (in dollars per share)	$ 2.50	$ 1.5366
Net proceeds from issuance of equity, net of issuance costs	$ 15,900	$ 5,100
Associated costs with private placement	$ 200