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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial instruments and fair value measurements (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Liabilities:
Convertible promissory notes	$ 51,922
Level 3
Liabilities:
Convertible promissory notes	$ 51,922

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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- Details

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Balance Type:
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