CAPITAL STOCK - Summary of Preferred Stock (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Temporary Equity [Line Items]
Preferred Shares Authorized (in shares)	4,446,228	4,182,943	5,000,000
Preferred Shares Issued (in shares)	1,256,466	1,256,466	0
Preferred Shares Outstanding (in shares)	1,256,466	1,256,466	0
Par Value	$ 13	$ 13
Carrying Value	$ 48,016	$ 58,290	$ 0
Common Stock Issued Upon Conversion (in shares)	1,256,466	1,256,466
Series A
Temporary Equity [Line Items]
Preferred Shares Authorized (in shares)	1,162,505	1,162,505
Preferred Shares Issued (in shares)	401,309	401,309
Preferred Shares Outstanding (in shares)	401,309	401,309
Par Value	$ 4	$ 4
Carrying Value	$ 12,164	$ 16,098
Common Stock Issued Upon Conversion (in shares)	401,309	401,309
Series B
Temporary Equity [Line Items]
Preferred Shares Authorized (in shares)	882,216	882,216
Preferred Shares Issued (in shares)	286,151	286,151
Preferred Shares Outstanding (in shares)	286,151	286,151
Par Value	$ 3	$ 3
Carrying Value	$ 10,084	$ 13,011
Common Stock Issued Upon Conversion (in shares)	286,151	286,151
Series C
Temporary Equity [Line Items]
Preferred Shares Authorized (in shares)	869,565	869,565
Preferred Shares Issued (in shares)	256,583	256,583
Preferred Shares Outstanding (in shares)	256,583	256,583
Par Value	$ 3	$ 3
Carrying Value	$ 11,630	$ 13,018
Common Stock Issued Upon Conversion (in shares)	256,583	256,583
Series C-1
Temporary Equity [Line Items]
Preferred Shares Authorized (in shares)	1,531,942	1,268,657
Preferred Shares Issued (in shares)	312,423	312,423
Preferred Shares Outstanding (in shares)	312,423	312,423
Par Value	$ 3	$ 3
Carrying Value	$ 14,138	$ 16,163
Common Stock Issued Upon Conversion (in shares)	312,423	312,423

Temporary Stock Issued During Period, Shares, Conversion Of Convertible Securities

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. 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. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. 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. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Carrying amount of the par value of temporary equity outstanding. 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 put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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