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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

The amount of short-term investments at amortized cost.

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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.

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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.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on short-term investments in debt and equity securities.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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
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