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Composition of Certain Financial Statement Captions - Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other Current Assets [Abstract] |  |
Prepaid services | $ 277 | $ 166
Prepaid insurance | 536 | 564
Other receivables | 144 | 55
Total other current assets | $ 957 | $ 785

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