Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Fair Value Liabilities Measured on Recurring Basis (Details)

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Summary of Significant Accounting Policies - Summary of Fair Value Liabilities Measured on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Preferred stock warrant liability $ 0 $ 260
Total liabilities   260
Level 3
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Preferred stock warrant liability   260
Total liabilities   $ 260