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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability $ 29,552 $ 40,171
Embedded conversion feature 1,690 2,608
Share-settled debt (in default) 855 3,308
Total fair value 32,097 46,087
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability 0 0
Embedded conversion feature 0 0
Share-settled debt (in default) 0 0
Total fair value 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability 0 0
Embedded conversion feature 0 0
Share-settled debt (in default) 0 0
Total fair value 0 0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability 29,552 40,171
Embedded conversion feature 1,690 2,608
Share-settled debt (in default) 855 3,308
Total fair value $ 32,097 $ 46,087