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Fair Value Measurements - Available For Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair value of available for sale marketable securities |  |
Amortized Cost | $ 38,500 | $ 72,799
Gross Unrealized Gains | 55 | 37
Gross Unrealized Losses | (2) | (8)
Fair Value | 38,553 | 72,828
U.S. Treasury securities |  |
Fair value of available for sale marketable securities |  |
Amortized Cost | 3,025 | 7,019
Gross Unrealized Gains | 4 | 4
Fair Value | 3,029 | 7,023
U.S. Government agency securities |  |
Fair value of available for sale marketable securities |  |
Amortized Cost | 24,481 | 17,701
Gross Unrealized Gains | 24 | 16
Gross Unrealized Losses | (2) |
Fair Value | 24,503 | 17,717
Corporate debt obligations |  |
Fair value of available for sale marketable securities |  |
Amortized Cost | 10,994 | 48,079
Gross Unrealized Gains | 27 | 17
Gross Unrealized Losses |  | (8)
Fair Value | $ 11,021 | $ 48,088

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