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Available-for-Sale Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) item
Available-for-Sale Securities
Amortized Cost		$ 14,935
Gross Unrealized Losses		(4)
Fair Value	$ 0	$ 14,931
Number of available-for-sale securities in an unrealized loss position | item		15
Number of available-for-sale securities in an unrealized loss position more than 12 months | item		0
Unrealized loss position, available-for-sale securities		$ 13,000
Proceeds from sales of available-for-sale securities	$ 0	7,800
Corporate debt securities
Available-for-Sale Securities
Amortized Cost		13,934
Gross Unrealized Losses		(4)
Fair Value		13,930
U.S. government-sponsored securities
Available-for-Sale Securities
Amortized Cost		1,001
Fair Value		$ 1,001

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
-Paragraph 2
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+ References

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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Number of investment positions in available-for-sale investments 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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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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