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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Assets: |  |
Total marketable securities |  | $ 93,001
Level 1 |  |
Fair Value Assets: |  |
Total marketable securities |  | 0
Level 2 |  |
Fair Value Assets: |  |
Total marketable securities |  | 93,001
Level 3 |  |
Fair Value Assets: |  |
Total marketable securities |  | 0
Cash equivalents |  |
Fair Value Assets: |  |
Cash equivalents |  | 20,155
Cash equivalents | Level 1 |  |
Fair Value Assets: |  |
Cash equivalents |  | 10,155
Cash equivalents | Level 2 |  |
Fair Value Assets: |  |
Cash equivalents |  | 10,000
Cash equivalents | Level 3 |  |
Fair Value Assets: |  |
Cash equivalents |  | 0
Municipal bonds |  |
Fair Value Assets: |  |
Total marketable securities |  | 44,705
Municipal bonds | Level 1 |  |
Fair Value Assets: |  |
Total marketable securities |  | 0
Municipal bonds | Level 2 |  |
Fair Value Assets: |  |
Total marketable securities |  | 44,705
Municipal bonds | Level 3 |  |
Fair Value Assets: |  |
Total marketable securities |  | 0
Corporate bonds |  |
Fair Value Assets: |  |
Total marketable securities |  | 48,296
Corporate bonds | Level 1 |  |
Fair Value Assets: |  |
Total marketable securities |  | 0
Corporate bonds | Level 2 |  |
Fair Value Assets: |  |
Total marketable securities |  | 48,296
Corporate bonds | Level 3 |  |
Fair Value Assets: |  |
Total marketable securities |  | 0
Investments in privately-held companies |  |
Fair Value Assets: |  |
Investments in privately-held companies | $ 4,871 | 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 | $ 4,871 | $ 3,390

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