CONVERTIBLE PREFERRED SHARES AND SHAREHOLDERS' DEFICIT - First Company Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Proceeds from the issuance of the Convertible Notes	$ 70,949
Series C \| First Company Repurchase
Equity, Class of Treasury Stock [Line Items]
Proceeds from the issuance of the Convertible Notes		$ 10,000
Number of shares repurchased		1,888,572
Price per share		$ 5.30
Carrying amount per share		$ 2.42
Carrying amount of shares repurchased		$ 4,600
Adjustment to additional paid-in capital related to excess fair value paid over carrying amount		$ 5,400

Amount of increase (decrease) in additional paid in capital related to excess fair value paid over carrying amount.

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Value of stock classified as temporary equity repurchased during the period.

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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 cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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