Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Carrying Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Promissory notes	$ 486	$ 694
Term loans	5,889	6,223
Estimated Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Promissory notes	486	694
Term loans	$ 5,889	$ 6,223