Fair Value Measurements (Additional Information) (Details) - USD ($) $ in Thousands		12 Months Ended
Jan. 11, 2018	Dec. 31, 2018	Dec. 31, 2017
Proceeds from Sale of Intangible Assets	$ 250	$ 250	$ 150
Assets, Fair Value Disclosure		450
Cost Method Investments		$ 2,482	834
Common Stock Remaining Shares		44,354
Proceeds from Sale of Other Investments		$ 200	$ 0
Marathon Patent Group Inc [Member]
Cost Method Investments		279
Cost-method Investments, Other than Temporary Impairment		148
Proceeds from Sale of Other Investments		$ 200
Cost Method Investments Number Of Shares Sold		205,646
MarathonCommonStock [Member]
Cost Method Investments		$ 23
MarathonCommonStock [Member] \| Patent Rights Purchase And Assignment Agreement [Member]
Number Of Shares Acquired Through Sale Of IntagibleAssets	250,000
MarathonCommonStock [Member] \| Marathon Patent Group Inc [Member]
Cost Method Investments		$ 5

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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Amount of cash inflow from the sale of investments classified as other.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 230
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Number of remaining shares of common stock outstanding.

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Number of shares of cost method investments sold during the period.

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The number of shares acquired through the sale of intangible assets during the period.

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