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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measurement (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Interest rate swap agreement | Level 2 |  |
Interest Rate Derivative Assets, at Fair Value | $ 3 | $ 80

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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |