v3.19.3.a.u2
Share-based Payments - Schedule of Activities in RSUs, RSAs and Other Contingently Issuable Shares Outstanding and Related Information (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Restricted Stock Units      
Disclosure Of Share Based Payments [Line Items]      
Number of Instruments, Beginning balance | shares 100,383 195,937 501,480
Instruments Granted | shares 715,224 14,383 80,920
Instruments Forfeited | shares (48,754) (15,991) (85,903)
Instruments Released | shares (128,503) (93,946) (300,560)
Number of Instruments, Ending balance | shares 638,350 100,383 195,937
Weighted average grant date fair value, Beginning balance | $ $ 63.87 $ 42.46 $ 36.73
Weighted average grant date fair value, Granted | $ 137.15 168.24 59.63
Weighted average grant date fair value, Forfeited | $ 118.96 34.93 37.43
Weighted average grant date fair value, Released | $ 98.52 40.12 38.95
Weighted average grant date fair value, Ending balance | $ $ 134.79 $ 63.87 $ 42.46
Restricted Stock Awards      
Disclosure Of Share Based Payments [Line Items]      
Number of Instruments, Beginning balance | shares 61,880 61,880 0
Instruments Granted | shares 0 0 61,880
Instruments Forfeited | shares 0 0 0
Instruments Released | shares (20,600) 0 0
Number of Instruments, Ending balance | shares 41,280 61,880 61,880
Weighted average grant date fair value, Beginning balance | $ $ 90.65 $ 90.65 $ 0
Weighted average grant date fair value, Granted | $ 0 0 90.65
Weighted average grant date fair value, Forfeited | $ 0 0 0
Weighted average grant date fair value, Released | $ 90.65 0 0
Weighted average grant date fair value, Ending balance | $ $ 90.65 $ 90.65 $ 90.65
Other      
Disclosure Of Share Based Payments [Line Items]      
Number of Instruments, Beginning balance | shares 0 0 0
Instruments Granted | shares 162,320 0 0
Instruments Forfeited | shares 0 0 0
Instruments Released | shares 0 0 0
Number of Instruments, Ending balance | shares 162,320 0 0
Weighted average grant date fair value, Beginning balance | $ $ 0 $ 0 $ 0
Weighted average grant date fair value, Granted | $ 145.21 0 0
Weighted average grant date fair value, Forfeited | $ 0 0 0
Weighted average grant date fair value, Released | $ 0 0 0
Weighted average grant date fair value, Ending balance | $ $ 134.15 $ 0 $ 0