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Long-Term Debt - Future Principal Payments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Debt Disclosure [Abstract]  
2014 (remaining three months ending June 30, 2014) $ 1,175
2015 4,700
2016 4,700
2017 4,700
2018 4,700
Thereafter 25,850
Long-term debt, net of unamortized discount $ 45,825