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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial instruments and fair value measurements (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |