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Share-Based Payments - Outstanding warrants (Details) - Warrants | 12 Months Ended
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Dec. 31, 2020 kr / shares | Dec. 31, 2019 kr / shares | Dec. 31, 2018 kr / shares
Share-Based Payments |  |  |
Number of warrants outstanding | 2,228,076 | 1,932,156 | 1,674,324
Average exercise price per warrant | kr 1 | kr 1 | kr 1
Remaining term to maturity | 15 years | 17 years | 18 years
Grant December 2016 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 20.91 | kr 20.91 | kr 20.91
Number of warrants outstanding | 712,332 | 712,332 | 712,332
Average exercise price per warrant | kr 1 | kr 1 | kr 1
Remaining term to maturity | 16 years | 17 years | 18 years
Grant April 2017 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 24.05 | kr 24.05 | kr 24.05
Number of warrants outstanding | 13,896 | 13,896 | 13,896
Average exercise price per warrant | kr 1 | kr 1 | kr 1
Remaining term to maturity | 16 years | 17 years | 18 years
Grant September 2017 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 28.71 | kr 28.71 | kr 28.71
Number of warrants outstanding | 617,184 | 617,184 | 617,184
Average exercise price per warrant | kr 1 | kr 1 | kr 1
Remaining term to maturity | 16 years | 17 years | 18 years
Grant December 2017 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 28.71 | kr 28.71 | kr 28.71
Number of warrants outstanding | 127,044 | 138,384 | 138,384
Average exercise price per warrant | kr 1 | kr 1 | kr 1
Remaining term to maturity | 16 years | 17 years | 18 years
Granted during 2018 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 37.05 | kr 37.05 | kr 37.05
Number of warrants outstanding | 181,836 | 192,528 | 192,528
Average exercise price per warrant | kr 1 | kr 1 | kr 1
Remaining term to maturity | 16 years | 17 years | 18 years
Grant January 2019 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value |  | kr 37.05 |
Number of warrants outstanding |  | 45,216 |
Average exercise price per warrant |  | kr 1 |
Remaining term to maturity |  | 17 years |
Grant February 2019 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 42.57 | kr 42.57 |
Number of warrants outstanding | 7,956 | 7,956 |
Average exercise price per warrant | kr 1 | kr 1 |
Remaining term to maturity | 16 years | 17 years |
Grant September 2019 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 56.35 | kr 56.35 |
Number of warrants outstanding | 54,000 | 54,000 |
Average exercise price per warrant | kr 1 | kr 1 |
Remaining term to maturity | 16 years | 17 years |
Grant October 2019 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 56.97 | kr 56.97 |
Number of warrants outstanding | 150,660 | 150,660 |
Average exercise price per warrant | kr 1 | kr 1 |
Remaining term to maturity | 16 years | 17 years |
Grant December 2020 |  |  |
Share-Based Payments |  |  |
Per warrant average grant date fair value | kr 56.75 |  |
Number of warrants outstanding | 363,168 |  |
Average exercise price per warrant | kr 1 |  |
Remaining term to maturity | 11 years |  |

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