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Fair value of financial instruments (Details) - Recurring - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value $ 8,620 $ 7,474
Amount of liability transferred into level 3 0 0
Amount of liability transferred out of level 3 0 0
Amount of liability transferred level 1 to level 2 0 0
Amount of liability transferred level 2 to level 1 0 0
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 0 0
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 8,620 7,474
Warrant liability    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 2,360 490
Warrant liability | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 0 0
Warrant liability | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 0 0
Warrant liability | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 2,360 490
Contingent consideration - Long term portion    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 6,260 6,984
Contingent consideration - Long term portion | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 0 0
Contingent consideration - Long term portion | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value 0 0
Contingent consideration - Long term portion | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities at fair value $ 6,260 $ 6,984