Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Details)

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Fair Value Measurements - Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (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]    
Derivative liabilities $ 4,589 $ 13,970
Conversion Feature of Note    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 3,741 2,612
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Level 1 | Conversion Feature of Note    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Level 2 | Conversion Feature of Note    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 4,589 13,970
Level 3 | Conversion Feature of Note    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 3,741 2,612
Common Stock    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 848 11,358
Common Stock | Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Common Stock | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities 0 0
Common Stock | Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative liabilities $ 848 $ 11,358