Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Reconciliation of Derivative Liability Measured At Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details)

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Fair Value Measurements - Reconciliation of Derivative Liability Measured At Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) (Warranty Liability, USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance $ (210) $ (3,309)
Issuances of derivatives (3,165) (871)
Modification of terms   (339)
Reclassification from liability to equity 5  
Change in fair value 1,325 189
Balance (2,045) (4,330)
Conversion Feature of Note
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Issuances of derivatives (1,930)  
Change in fair value 12  
Balance (1,918)  
Common Stock
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance (199) (2,783)
Issuances of derivatives (1,235) (871)
Modification of terms   (339)
Change in fair value 1,307 116
Balance (127) (3,877)
Preferred Stock
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance (11) (526)
Reclassification from liability to equity 5  
Change in fair value 6 73
Balance   $ (453)