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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investment	$ 552	$ 552
Highview Obligation	208	220
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost method investment	552	552
Highview Obligation	$ 208	$ 220

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- Definition

Other Liabilities, Fair Value Disclosure, Current

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- Definition

Fair value portion of investments accounted under the cost method.

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- Definition

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