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Short-Term Investments (Details) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) instrument	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) instrument
Short-Term Investments
Amortized Cost		$ 36,495		$ 22,280
Gross Unrealized Gains		1
Gross Unrealized Losses				(4)
Fair Value		$ 36,496		$ 22,276
Number of short term investments in unrealized loss position | instrument		1		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		$ 2,000		$ 7,300
Proceeds from Sale of Short-term Investments	$ 0		$ 0
Corporate debt securities
Short-Term Investments
Amortized Cost		5,495		7,280
Gross Unrealized Gains		1
Gross Unrealized Losses				(4)
Fair Value		5,496		7,276
Reverse repurchase agreements
Short-Term Investments
Amortized Cost		31,000		15,000
Fair Value		$ 31,000		$ 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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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 gain in accumulated other comprehensive income (AOCI) on Short-term investments in debt and equity securities.

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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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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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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.

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