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Short-term Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 14,267 | $ 6,494
Unrealized Gains | 18 | 15
Unrealized Losses | (15) | (14)
Fair Value | 14,270 | 6,495
Commercial paper |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 8,267 | 998
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 8,267 | 998
Overnight repurchase agreement |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost |  | 3,500
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Fair Value |  | 3,500
U.S. government securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 6,000 | 1,996
Unrealized Gains | 18 | 15
Unrealized Losses | (15) | (14)
Fair Value | $ 6,003 | $ 1,997

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