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Stock-based Compensation - Schedule of RSU Activity (Detail)
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Restricted Stock Units (RSUs) [Member]  
Share equivalent  
Share equivalent, Beginning Balance | shares 0
Share equivalent, Granted | shares 140,000
Share equivalent, Vested | shares 0
Share equivalent, Forfeited | shares 0
Share equivalent, Cancelled | shares 0
Share equivalent, Ending Balance | shares 140,000
Weighted-average grant date fair value  
Weighted-average grant date fair value, Beginning Balance | $ / shares $ 0.00
Weighted-average grant date fair value, Granted | $ / shares 7.76
Weighted-average grant date fair value, Vested | $ / shares 0
Weighted-average grant date fair value, Forfeited | $ / shares 0
Weighted-average grant date fair value, Cancelled | $ / shares 0
Weighted-average grant date fair value, Ending Balance | $ / shares $ 7.76
Performance-based RSUs [Member]  
Share equivalent  
Share equivalent, Beginning Balance | shares 0
Share equivalent, Granted | shares 1,050,000
Share equivalent, Vested | shares 0
Share equivalent, Forfeited | shares 0
Share equivalent, Cancelled | 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 $ 0.00
Weighted-average grant date fair value, Granted | $ / shares 7.76
Weighted-average grant date fair value, Vested | $ / shares 0
Weighted-average grant date fair value, Forfeited | $ / shares 0
Weighted-average grant date fair value, Cancelled | $ / shares 0
Weighted-average grant date fair value, Ending Balance | $ / shares $ 7.76