Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details)

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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Sep. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financial liabilities $ 6,248 $ 8,656 $ 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 6,248 8,656 4,916
Convertible note embedded derivative liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liability 3,113 4,676 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 3,113 4,676 3,693
Warrant liability      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liability 3,135 3,980 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 $ 3,135 $ 3,980 $ 1,223