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Share-based Payments - Schedule of Activities in RSUs, RSAs and Other Contingently Issuable Shares Outstanding and Related Information (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Restricted Stock Units      
Disclosure Of Share Based Payments [Line Items]      
Number of Instruments, Beginning balance | shares 638,350 100,383 195,937
Instruments Granted | shares 1,127,149 715,224 14,383
Instruments Forfeited | shares (91,613) (48,754) (15,991)
Instruments Released | shares (353,693) (128,503) (93,946)
Number of Instruments, Ending balance | shares 1,320,193 638,350 100,383
Weighted average grant date fair value, Beginning balance | $ $ 134.79 $ 63.87 $ 42.46
Weighted average grant date fair value, Granted | $ 161.50 137.15 168.24
Weighted average grant date fair value, Forfeited | $ 143.13 118.96 34.93
Weighted average grant date fair value, Released | $ 138.66 98.52 40.12
Weighted average grant date fair value, Ending balance | $ $ 155.98 $ 134.79 $ 63.87
Restricted Stock Awards      
Disclosure Of Share Based Payments [Line Items]      
Number of Instruments, Beginning balance | shares 41,280 61,880 61,880
Instruments Granted | shares 0 0 0
Instruments Forfeited | shares 0 0 0
Instruments Released | shares (41,280) (20,600) 0
Number of Instruments, Ending balance | shares 0 41,280 61,880
Weighted average grant date fair value, Beginning balance | $ $ 90.65 $ 90.65 $ 90.65
Weighted average grant date fair value, Granted | $ 0 0 0
Weighted average grant date fair value, Forfeited | $ 0 0 0
Weighted average grant date fair value, Released | $ 90.65 90.65 0
Weighted average grant date fair value, Ending balance | $ $ 0 $ 90.65 $ 90.65
Other      
Disclosure Of Share Based Payments [Line Items]      
Number of Instruments, Beginning balance | shares 162,320 0 0
Instruments Granted | shares 34,450 162,320 0
Instruments Forfeited | shares 0 0 0
Instruments Released | shares (40,580) 0 0
Number of Instruments, Ending balance | shares 156,190 162,320 0
Weighted average grant date fair value, Beginning balance | $ $ 145.21 $ 0 $ 0
Weighted average grant date fair value, Granted | $ 145.14 145.21 0
Weighted average grant date fair value, Forfeited | $ 0 0 0
Weighted average grant date fair value, Released | $ 145.21 0 0
Weighted average grant date fair value, Ending balance | $ $ 145.19 $ 145.21 $ 0