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FAIR VALUE DISCLOSURES (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of financial instruments measured at fair value on recurring basis | Financial instruments measured at fair value on a recurring basis as of December 31, 2019 and 2018 are as follows (in thousands):
| December 31, 2019 |  | Total
| Fair value measurements using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
Money market funds | $ | 63,351 |  |  | $ | — |  |  | $ | — |  |  | $ | 63,351 |
U.S. Treasury securities | — |  |  | 3,019 |  |  | — |  |  | 3,019 |
Total assets at fair value (1) | $ | 63,351 |  |  | $ | 3,019 |  |  | $ | — |  |  | $ | 66,370 |
| December 31, 2018 |  | Total
| Fair value measurements using |
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
Money market funds | $ | 81,425 |  |  | $ | — |  |  | $ | — |  |  | $ | 81,425 |
U.S. Treasury securities | — |  |  | 13,930 |  |  | — |  |  | 13,930 |
Total assets at fair value (1) | $ | 81,425 |  |  | $ | 13,930 |  |  | $ | — |  |  | $ | 95,355 |
(1) The above tables exclude $23.1 million and $29.6 million of cash held in banks as of December 31, 2019 and 2018, respectively.
Schedule of short-term investments | Short-term investments as of December 31, 2019 and 2018 consisted of the following (in thousands):
| December 31, 2019
| Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
U.S. Treasury securities | $ | 3,018 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 3,019 |
Total | $ | 3,018 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 3,019 |
| December 31, 2018
| Amortized Cost |  | Gross Unrealized Holding Gains |  | Gross Unrealized Holding Losses |  | Fair Value
U.S. Treasury securities | $ | 13,936 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 13,930 |
Total | $ | 13,936 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 13,930 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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 (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: 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 Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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