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Fair value of financial instruments - Fair Value Liabilities Measured on Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure $ 18,848 $ 9,200
Merger Warrants - Private    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 348 0
Series B Preferred - Conversion Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 18,500 8,800
Series B-1 Preferred Stock 6% Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 400
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) | Merger Warrants - Private    
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 - Conversion Warrants    
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    
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 348 0
Significant Other Observable Inputs (Level 2) | Merger Warrants - Private    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 348 0
Significant Other Observable Inputs (Level 2) | Series B Preferred - Conversion Warrants    
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    
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 18,500 9,200
Significant Unobservable Inputs (Level 3) | Merger Warrants - Private    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 0 0
Significant Unobservable Inputs (Level 3) | Series B Preferred - Conversion Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure 18,500 8,800
Significant Unobservable Inputs (Level 3) | Series B-1 Preferred Stock 6% Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Obligations, Fair Value Disclosure $ 0 $ 400