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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
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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 + Details
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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 No definition available. + Details
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- Definition 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. + References No definition available. + Details
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