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Share-based payments (Details 4)
 6 Months Ended
Jun. 30, 2022
€ / shares
shares
Statement [Line Items]  
Share option | shares 1,561,666
January Twelve One  
Statement [Line Items]  
Share option | shares 1,516,666
Fair value at grant date per option (USD) € 3.66
Fair value at grant date FX rate as of grant date 0.9008
Fair value at grant date per option (EUR) 3.30
Share price at grant date (USD) € 4.13
Expected volatility 1.35%
Expected life (midpoint based) € 5.31
Risk-free rate (interpolated, U.S. sovereign strips curve) 1.57%
January Twelve Two  
Statement [Line Items]  
Share option | shares 45,000
Fair value at grant date per option (USD) € 3.68
Fair value at grant date FX rate as of grant date 0.9008
Fair value at grant date per option (EUR) 3.32
Share price at grant date (USD) € 4.13
Expected volatility 1.35%
Expected life (midpoint based) € 5.50
Risk-free rate (interpolated, U.S. sovereign strips curve) 1.59%
Repricing | January Twelve One  
Statement [Line Items]  
Share option | shares 1,516,666
Fair value at grant date per option (USD) € 1.61
Fair value at grant date FX rate as of grant date 0.9237
Fair value at grant date per option (EUR) 1.49
Share price at grant date (USD) € 1.86
Expected volatility 1.35%
Expected life (midpoint based) € 4.69
Risk-free rate (interpolated, U.S. sovereign strips curve) 2.60%
Repricing | January Twelve Two  
Statement [Line Items]  
Share option | shares 45,000
Fair value at grant date per option (USD) € 1.59
Fair value at grant date FX rate as of grant date 0.9237
Fair value at grant date per option (EUR) 1.47
Share price at grant date (USD) € 1.86
Expected volatility 1.35%
Expected life (midpoint based) € 4.50
Risk-free rate (interpolated, U.S. sovereign strips curve) 2.60%