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Fair value of financial instruments - Fair Value Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure $ 2,200 $ 17,591
Series B Preferred - Series A Conversion Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 1,800 4,317
Series B-1 Preferred Stock 6% Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 400 400
Series B Preferred Stock Warrants at closing[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 11,491
Rights Offering Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 1,383
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Series B Preferred - Series A Conversion Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Series B-1 Preferred Stock 6% Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Series B Preferred Stock Warrants at closing[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Rights Offering Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Significant Other Observable Inputs (Level 2) | Series B Preferred - Series A Conversion Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Significant Other Observable Inputs (Level 2) | Series B-1 Preferred Stock 6% Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Significant Other Observable Inputs (Level 2) | Series B Preferred Stock Warrants at closing[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Significant Other Observable Inputs (Level 2) | Rights Offering Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 2,200 17,591
Significant Unobservable Inputs (Level 3) | Series B Preferred - Series A Conversion Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 1,800 4,317
Significant Unobservable Inputs (Level 3) | Series B-1 Preferred Stock 6% Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 400 400
Significant Unobservable Inputs (Level 3) | Series B Preferred Stock Warrants at closing[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 11,491
Significant Unobservable Inputs (Level 3) | Rights Offering Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure $ 0 $ 1,383