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Share-based compensation - Schedule of Activities in RSUs, RSAs and Other Contingently Issuable Shares Outstanding and Related Information (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Restricted stock units      
Disclosure Of Share Based Payments [Line Items]      
Beginning balance (in shares) | shares 1,320,193 638,350 100,383
Granted (in shares) | shares 793,337 1,127,149 715,224
Forfeited (in shares) | shares (175,751) (91,613) (48,754)
Released (in shares) | shares (512,583) (353,693) (128,503)
Ending balance (in shares) | shares 1,425,196 1,320,193 638,350
Weighted average grant date fair value, Beginning balance (in dollars per share) | $ $ 155.98 $ 134.79 $ 63.87
Weighted average grant date fair value, Granted (in dollars per share) | $ 277.21 161.50 137.15
Weighted average grant date fair value, Forfeited (in dollars per share) | $ 190.26 143.13 118.96
Weighted average grant date fair value, Released (in dollars per share) | $ 178.19 138.66 98.52
Weighted average grant date fair value, Ending balance in (in dollars per share) | $ $ 211.25 $ 155.98 $ 134.79
Restricted stock awards      
Disclosure Of Share Based Payments [Line Items]      
Beginning balance (in shares) | shares 0 41,280 61,880
Granted (in shares) | shares 0 0 0
Forfeited (in shares) | shares 0 0 0
Released (in shares) | shares 0 (41,280) (20,600)
Ending balance (in shares) | shares 0 0 41,280
Weighted average grant date fair value, Beginning balance (in dollars per share) | $ $ 0 $ 90.65 $ 90.65
Weighted average grant date fair value, Granted (in dollars per share) | $ 0 0 0
Weighted average grant date fair value, Forfeited (in dollars per share) | $ 0 0 0
Weighted average grant date fair value, Released (in dollars per share) | $ 0 90.65 90.65
Weighted average grant date fair value, Ending balance in (in dollars per share) | $ $ 0 $ 0 $ 90.65
Other      
Disclosure Of Share Based Payments [Line Items]      
Beginning balance (in shares) | shares 156,190 162,320 0
Granted (in shares) | shares 22,988 34,450 162,320
Forfeited (in shares) | shares 0 0 0
Released (in shares) | shares (70,458) (40,580) 0
Ending balance (in shares) | shares 108,720 156,190 162,320
Weighted average grant date fair value, Beginning balance (in dollars per share) | $ $ 145.19 $ 145.21 $ 0
Weighted average grant date fair value, Granted (in dollars per share) | $ 261.00 145.14 145.21
Weighted average grant date fair value, Forfeited (in dollars per share) | $ 0 0 0
Weighted average grant date fair value, Released (in dollars per share) | $ 182.98 145.21 0
Weighted average grant date fair value, Ending balance in (in dollars per share) | $ $ 145.19 $ 145.19 $ 145.21