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Marketable Equity Securities - Changes in Marketable Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Gross (loss) recorded in the statement of operations	$ (326)	$ (441)
Change in marketable equity securities at fair value	$ (326)	$ (441)

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- References

No definition available.

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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No definition available.

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