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Profits interest incentive plan - Summary of Activity Under the Plan (Details)
12 Months Ended
Dec. 31, 2020
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock Options Outstanding, Beginning Balance, Number of Shares 14,478,949
Cancelled (170,836)
Assumption of Plan by Himalaya Parent LLC on July 10, 2020 (14,308,113)
Stock Options Outstanding, Ending Balance, Number of Shares 0