Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements - Reconciliation of Warrant Liability Measured At Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) (Warranty Liability, USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance $ (210) $ (3,309)
Issuance of warrants      
Modification of warrant terms   (424)
Change in fair value included in earnings, as other income (114) 105
Balance (319) (3,628)
Reclassification from liability to equity 5  
Common Stock
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance (199) (2,783)
Issuance of warrants      
Modification of warrant terms   (424)
Change in fair value included in earnings, as other income (120) 85
Balance (319) (3,122)
Preferred Stock
    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance (11) (526)
Issuance of warrants      
Change in fair value included in earnings, as other income 6 20
Balance   (506)
Reclassification from liability to equity $ 5