STOCKHOLDERS' DEFICIT - Activity Related to Series A and C Preferred Stock (Details) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($)
Series A Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning Balance	$ 2,827
Dividends and discount accretion through September 30, 2018	299
Ending Balance	3,126
Series C Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning Balance	79,252
Dividends and discount accretion through September 30, 2018	7,973
Ending Balance	$ 87,225

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

No definition available.

Name:	us-gaap_TemporaryEquityCarryingAmountAttributableToParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant