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Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Summary of assets measured at fair value on a recurring basis |  |
Total assets | $ 33,714 | $ 33,180
Level 1 |  |
Summary of assets measured at fair value on a recurring basis |  |
Total assets | 5,432 | 5,956
Level 2 |  |
Summary of assets measured at fair value on a recurring basis |  |
Total assets | 28,282 | 27,224
Money market fund |  |
Summary of assets measured at fair value on a recurring basis |  |
Cash and cash equivalents | 5,432 | 5,956
Money market fund | Level 1 |  |
Summary of assets measured at fair value on a recurring basis |  |
Cash and cash equivalents | 5,432 | 5,956
Commercial Paper |  |
Summary of assets measured at fair value on a recurring basis |  |
Short-term investments | 1,993 |
Commercial Paper | Level 2 |  |
Summary of assets measured at fair value on a recurring basis |  |
Short-term investments | 1,993 |
Corporate debt securities |  |
Summary of assets measured at fair value on a recurring basis |  |
Cash and cash equivalents | 1,937 | 1,948
Short-term investments | 3,352 | 7,276
Corporate debt securities | Level 2 |  |
Summary of assets measured at fair value on a recurring basis |  |
Cash and cash equivalents | 1,937 | 1,948
Short-term investments | 3,352 | 7,276
Reverse repurchase agreements |  |
Summary of assets measured at fair value on a recurring basis |  |
Cash and cash equivalents |  | 3,000
Short-term investments | 21,000 | 15,000
Reverse repurchase agreements | Level 2 |  |
Summary of assets measured at fair value on a recurring basis |  |
Cash and cash equivalents |  | 3,000
Short-term investments | $ 21,000 | $ 15,000

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