Annual report pursuant to Section 13 and 15(d) 12-31-2015

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

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Fair Value Measurements - Schedule of Reconciliation of Derivative Liability Measured on Recurring Basis Using Unobservable Inputs (Level 3) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in fair value $ 7,605 $ 251
Derivative Financial Instruments, Liabilities [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance (13,970) (210)
Issuances of derivatives (14,556) (14,547)
Modification of terms (382)  
Decrease in liability due to debt conversions 179  
Decrease in liability due to warrants being exercised 20,335  
Reclassification from liability to equity 2,403 5
Extinguishment of derivative liabilities 3,468 1,032
Change in fair value 1,925 (250)
Ending balance (598) (13,970)
Derivative Financial Instruments, Liabilities [Member] | Common Stock Warrants [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance (11,358) (199)
Issuances of derivatives (14,556) $ (12,617)
Modification of terms $ (382)  
Decrease in liability due to debt conversions  
Decrease in liability due to warrants being exercised $ 20,335  
Reclassification from liability to equity $ 2,403
Extinguishment of derivative liabilities $ 24
Change in fair value $ 2,960 1,434
Ending balance $ (598) (11,358)
Derivative Financial Instruments, Liabilities [Member] | Preferred Stock Warrants[Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ (11)
Issuances of derivatives
Modification of terms  
Decrease in liability due to debt conversions  
Decrease in liability due to warrants being exercised  
Reclassification from liability to equity $ 5
Extinguishment of derivative liabilities
Change in fair value $ 6
Ending balance
Derivative Financial Instruments, Liabilities [Member] | Conversion Feature Of Notes [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ (2,612)
Issuances of derivatives $ (1,930)
Modification of terms  
Decrease in liability due to debt conversions $ 179  
Decrease in liability due to warrants being exercised  
Reclassification from liability to equity
Extinguishment of derivative liabilities $ 3,468 $ 1,008
Change in fair value $ (1,035) (1,690)
Ending balance $ (2,612)