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Short-Term Investments (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) instrument | Dec. 31, 2018 USD ($) instrument
Short-Term Investments |  |
Amortized Cost | $ 22,850 | $ 22,280
Gross Unrealized Losses |  | (4)
Fair Value | $ 22,850 | $ 22,276
Number of short term investments in unrealized loss position | instrument |  | 7
Number of short term investments in an unrealized loss position more than 12 months | instrument | 0 |
Aggregate fair value of the investments in an unrealized loss position | $ 0 | $ 7,300
Corporate debt securities |  |
Short-Term Investments |  |
Amortized Cost | 1,850 | 7,280
Gross Unrealized Losses |  | (4)
Fair Value | 1,850 | 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 This item represents the aggregate fair value of short term investments, that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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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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- Definition Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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