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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Assets |  |
Total marketable securities | $ 59,549 | $ 93,001
Level 1 |  |
Fair Value Assets |  |
Total marketable securities | 0 | 0
Level 2 |  |
Fair Value Assets |  |
Total marketable securities | 59,549 | 93,001
Level 3 |  |
Fair Value Assets |  |
Total marketable securities | 0 | 0
Cash equivalents |  |
Fair Value Assets |  |
Cash equivalents | 5,653 | 20,155
Cash equivalents | Level 1 |  |
Fair Value Assets |  |
Cash equivalents | 5,653 | 10,155
Cash equivalents | Level 2 |  |
Fair Value Assets |  |
Cash equivalents | 0 | 10,000
Cash equivalents | Level 3 |  |
Fair Value Assets |  |
Cash equivalents | 0 | 0
Municipal bonds |  |
Fair Value Assets |  |
Total marketable securities | 29,646 | 44,705
Municipal bonds | Level 1 |  |
Fair Value Assets |  |
Total marketable securities | 0 | 0
Municipal bonds | Level 2 |  |
Fair Value Assets |  |
Total marketable securities | 29,646 | 44,705
Municipal bonds | Level 3 |  |
Fair Value Assets |  |
Total marketable securities | 0 | 0
Corporate bonds |  |
Fair Value Assets |  |
Total marketable securities | 29,903 | 48,296
Corporate bonds | Level 1 |  |
Fair Value Assets |  |
Total marketable securities | 0 | 0
Corporate bonds | Level 2 |  |
Fair Value Assets |  |
Total marketable securities | 29,903 | 48,296
Corporate bonds | Level 3 |  |
Fair Value Assets |  |
Total marketable securities | 0 | 0
Investments in privately-held companies |  |
Fair Value Assets |  |
Investments in privately-held companies | 3,890 | 3,390
Investments in privately-held companies | Level 1 |  |
Fair Value Assets |  |
Investments in privately-held companies | 0 | 0
Investments in privately-held companies | Level 2 |  |
Fair Value Assets |  |
Investments in privately-held companies | 0 | 0
Investments in privately-held companies | Level 3 |  |
Fair Value Assets |  |
Investments in privately-held companies | $ 3,890 | $ 3,390

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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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