Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Liabilities (Details)

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Fair Value Measurements - Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Sep. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities $ 9,498 $ 4,294 $ 4,916
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities 0 0 0
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities 0 0 0
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities 9,498 4,294 4,916
Convertible note embedded derivative liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 5,896 3,218 3,693
Convertible note embedded derivative liability | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Convertible note embedded derivative liability | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Convertible note embedded derivative liability | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability   3,218 3,693
Warrant liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 3,602 1,076 1,223
Warrant liability | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Warrant liability | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Warrant liability | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability   1,076 $ 1,223
Warrant liability | Warrant liability | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability $ 3,602 $ 1,076