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Short-Term Investments (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) instrument | Dec. 31, 2018 USD ($) instrument
Short-Term Investments |  |
Amortized Cost | $ 26,345 | $ 22,280
Gross Unrealized Losses |  | (4)
Fair Value | $ 26,345 | $ 22,276
Number of short term investments in unrealized loss position | instrument | 4 | 7
Number of short term investments in an unrealized loss position more than 12 months | instrument | 0 | 0
Aggregate fair value of the investments in an unrealized loss position | $ 3,400 | $ 7,300
Commercial Paper |  |
Short-Term Investments |  |
Amortized Cost | 1,993 |
Fair Value | 1,993 |
Corporate debt securities |  |
Short-Term Investments |  |
Amortized Cost | 3,352 | 7,280
Gross Unrealized Losses |  | (4)
Fair Value | 3,352 | 7,276
Reverse repurchase agreements |  |
Short-Term Investments |  |
Amortized Cost | 21,000 | 15,000
Fair Value | $ 21,000 | $ 15,000

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- Definition Number of short term investment positions that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on short-term investments in debt and equity securities. + References No definition available. + Details
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- Definition Number of Short term investment positions in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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