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Stock-Based Compensation - Schedule of RSU Activity (Detail) - 2018 Equity Incentive Plan [Member]
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Time-based RSU [Member]  
Share equivalent  
Share equivalent, Beginning Balance | shares 0
Share equivalent, Granted | shares 238,082
Share equivalent, Exercised | shares 0
Share equivalent, Forfeited | shares (860)
Share equivalent, Ending Balance | shares 237,222
Weighted-average grant date fair value  
Weighted-average grant date fair value, Beginning Balance | $ / shares $ 0
Weighted-average grant date fair value, Granted | $ / shares 50.08
Weighted-average grant date fair value, Exercised | $ / shares 0
Weighted-average grant date fair value, Forfeited | $ / shares 110
Weighted-average grant date fair value, Ending Balance | $ / shares $ 49.86
Performance-based RSUs [Member]  
Share equivalent  
Share equivalent, Beginning Balance | shares 0
Share equivalent, Granted | shares 1,050,000
Share equivalent, Exercised | shares 0
Share equivalent, Forfeited | shares 0
Share equivalent, Ending Balance | shares 1,050,000
Weighted-average grant date fair value  
Weighted-average grant date fair value, Beginning Balance | $ / shares $ 0
Weighted-average grant date fair value, Granted | $ / shares 7.76
Weighted-average grant date fair value, Exercised | $ / shares 0
Weighted-average grant date fair value, Forfeited | $ / shares 0
Weighted-average grant date fair value, Ending Balance | $ / shares $ 7.76