Quarterly report pursuant to Section 13 or 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) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of derivative liability $ 6,697 $ 5,818
Quoted Pricesin ActiveMarkets forIdenticalAssets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of derivative liability 0 0
Significant OtherObservable Inputs(Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of derivative liability 0 0
Significant OtherUnobservable Inputs(Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of derivative liability $ 6,697 $ 5,818