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Prepaid Expenses and Other Current Assets | 12 Months Ended
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Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |
Prepaid Expenses and Other Current Assets |
4. | Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Prepaid research and development services |  | $ | 3,043 |  |  | $ | 245 |
Prepaid insurance |  |  | 252 |  |  |  | 200 |
Other prepaid expenses |  |  | 19 |  |  |  | 20 |
NOL sale receivable (see Note 10) |  |  | — |  |  |  | 6,732 |
Other current assets |  |  | 674 |  |  |  | 54 |
Total prepaid expenses and other current assets |  | $ | 3,988 |  |  | $ | 7,251 |

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