Annual report pursuant to Section 13 and 15(d)

Basis of presentation, principles of consolidation and significant accounting policies - Fair Value of Warrant Liability (Details)

v3.20.1
Basis of presentation, principles of consolidation and significant accounting policies - Fair Value of Warrant Liability (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of warrant liability $ 5,818 $ 1,508
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of warrant liability 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of warrant liability 0 0
Significant Other Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of warrant liability $ 5,818 $ 1,508