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CONVERTIBLE NOTES - Conversion of 2019 Convertible Notes (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2019	Dec. 31, 2019
Debt Conversion [Line Items]
Principal amount converted		$ 28,144
Shares of Series D convertible preferred stock issued		19,711,869
Conversion of 2019 Convertible Notes | 2019 Convertible Notes
Debt Conversion [Line Items]
Principal amount converted	$ 30,200
Shares of Series D convertible preferred stock issued	19,711,869
Adjustments to Additional Paid in Capital, Discount on Issuance	$ 2,100

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- Definition

The amount of increase (decrease) in additional paid in capital due to discount on issuance of warrants Associated with notes.

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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in 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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