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Short-term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 6,494 | $ 32,718
Unrealized Gains | 15 | 14
Unrealized Losses | (14) | (15)
Fair Value | 6,495 | 32,717
Commercial paper |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 998 | 8,772
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 998 | 8,772
Overnight repurchase agreement |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 3,500 | 9,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 3,500 | 9,000
U.S. government securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,996 | 14,946
Unrealized Gains | 15 | 14
Unrealized Losses | (14) | (15)
Fair Value | $ 1,997 | $ 14,945

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