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Fair Value Measurements - Assets Measured on a Recurring Basis (Details) - Recurring Fair Value Measurements - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents $ 35,656 $ 46,985
Fair value of liabilities 6,601  
Warrant liability    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of liabilities 6,601  
Cash on deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 9,767 46,935
Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 25,889 50
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 35,656 46,985
Fair value of liabilities 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Warrant liability    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of liabilities 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash on deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 9,767 46,935
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 25,889 50
Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 0 0
Fair value of liabilities 0  
Significant Other Observable Inputs (Level 2) | Warrant liability    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of liabilities 0  
Significant Other Observable Inputs (Level 2) | Cash on deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 0 0
Significant Other Observable Inputs (Level 2) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents   0
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents 0 0
Fair value of liabilities 6,601  
Significant Unobservable Inputs (Level 3) | Warrant liability    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of liabilities 6,601  
Significant Unobservable Inputs (Level 3) | Cash on deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents $ 0 0
Significant Unobservable Inputs (Level 3) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of cash equivalents   $ 0