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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of selected quarterly financial information (unaudited) |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
|  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
|  | (In thousands, except per share amounts) |
Year Ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 57 |  |  | $ | 101 |  |  | $ | 131 |  |  | $ | 171 |
Operating expenses |  |  | 11,358 |  |  |  | 15,325 |  |  |  | 16,103 |  |  |  | 30,179 |
Net loss |  |  | (10,059 | ) |  |  | (14,239 | ) |  |  | (15,180 | ) |  |  | (29,070 | )
Basic and diluted net loss per share |  | $ | (0.05 | ) |  | $ | (0.08 | ) |  | $ | (0.08 | ) |  | $ | (0.15 | )
Year Ended December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 318 |  |  | $ | 208 |  |  | $ | 165 |  |  | $ | 375 |
Operating expenses |  |  | 7,755 |  |  |  | 7,450 |  |  |  | 6,970 |  |  |  | 9,964 |
Net loss |  |  | (7,186 | ) |  |  | (6,934 | ) |  |  | (5,597 | ) |  |  | (7,300 | )
Basic and diluted net loss per share |  | $ | (0.04 | ) |  | $ | (0.04 | ) |  | $ | (0.03 | ) |  | $ | (0.04 | )

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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