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v3.19.3.a.u2

Fair Value Measurements - Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value Measurements |  |
Amount of transfers of financial assets between Level 1 and Level 2 measures | $ 0 |
Total short-term investments | $ 16,506 | $ 34,036

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