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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments Outstanding (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]        
Cash and cash equivalents, cost $ 3,501 $ 3,868 $ 5,330 $ 8,766
Cash and cash equivalents, fair value $ 3,501 $ 3,868