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CASH EQUIVALENTS AND INVESTMENTS - Schedule of Cash Equivalents and Investments by Measurement (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Cash and cash equivalents, Marketable securities and Investments |  |
Cash equivalents, fair value |  | $ 310
Marketable securities, fair value | $ 0 | 7,284
Quoted prices in active markets (Level 1) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Cash equivalents, fair value |  | 310
Marketable securities, fair value |  | 0
Significant other observable inputs (Level 2) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Cash equivalents, fair value |  | 0
Marketable securities, fair value |  | 7,284
Significant unobservable inputs (Level 3) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Cash equivalents, fair value |  | 0
Marketable securities, fair value |  | 0
U.S. government agency notes |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | 3,989
U.S. government agency notes | Quoted prices in active markets (Level 1) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | 0
U.S. government agency notes | Significant other observable inputs (Level 2) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | 3,989
U.S. government agency notes | Significant unobservable inputs (Level 3) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | 0
Corporate debt securities |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | 3,295
Corporate debt securities | Quoted prices in active markets (Level 1) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | 0
Corporate debt securities | Significant other observable inputs (Level 2) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | 3,295
Corporate debt securities | Significant unobservable inputs (Level 3) |  |
Cash and cash equivalents, Marketable securities and Investments |  |
Marketable securities, fair value |  | $ 0

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- Definition Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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