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 |