Quarterly report pursuant to Section 13 or 15(d)

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

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Summary of Significant Accounting Policies - Summary of Fair Value Assets Measured on Recurring Basis (Details) - Fair Value Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets $ 23,587 $ 11,633
Certificates Of Deposit    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets 23,587 11,633
Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets 23,587 11,633
Level 2 | Certificates Of Deposit    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets $ 23,587 $ 11,633