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
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance $ (210) $ (3,309)
Issuances of derivatives     
Modification of terms (1,954) (424)
Reclassification from liability to equity 5  
Change in fair value included in earnings, as other income (loss) (562) 160
Balance (2,721) (3,573)
Conversion Feature of Note
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Issuances of derivatives     
Modification of terms (848)  
Balance (848)  
Common Stock
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance (199) (2,783)
Issuances of derivatives     
Modification of terms (1,106) (424)
Change in fair value included in earnings, as other income (loss) (568) 130
Balance (1,873) (3,077)
Preferred Stock
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance (11) (526)
Issuances of derivatives     
Reclassification from liability to equity 5  
Change in fair value included in earnings, as other income (loss) 6 30
Balance   $ (496)