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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets measured at fair value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Quoted Prices in Active Markets for Identical Assets (Level 1)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Total	$ 46,174	$ 47,939
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds (included in cash and cash equivalents)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Money market funds (included in cash and cash equivalents)	46,174	47,939
Significant Other Observable Inputs (Level 2)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Total	0	0
Significant Other Observable Inputs (Level 2) | Money market funds (included in cash and cash equivalents)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Money market funds (included in cash and cash equivalents)	0	0
Significant Unobservable Inputs (Level 3)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Total	0	0
Significant Unobservable Inputs (Level 3) | Money market funds (included in cash and cash equivalents)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Money market funds (included in cash and cash equivalents)	$ 0	$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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+ References

No definition available.

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