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Marketable Equity Securities - Changes in Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Gross (loss) recorded in the statement of operations	$ (63)	$ (222)	$ (389)	$ (663)
Change in marketable equity securities at fair value	$ (63)	$ (222)	$ (389)	$ (663)

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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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