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Share-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Option [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Number of Shares  
Outstanding, Beginning Balance  
Granted 2,012,106
Exercised 0
Forfeited (810)
Outstanding Ending Balance 2,011,296
Outstanding- vested and expected to vest Ending Balance 2,011,296
Exercisable Ending Balance 357,494
Weighted Average Exercise Price  
Outstanding Beginning Balance | $ / shares  
Granted | $ / shares $ 7.24
Forfeited | $ / shares 5.90
Outstanding Ending Balance | $ / shares 7.24
Outstanding- vested and expected to vest Ending Balance | $ / shares 7.24
Exercisable Ending Balance | $ / shares $ 5.90
Weighted Average Contractual Term  
Outstanding Ending Balance 9 years 4 months 17 days
Outstanding - vested and expected to vest Ending Balance 9 years 4 months 17 days
Exercisable Ending Balance 9 years 3 months 14 days
Aggregate Intrinsic Value  
Outstanding Ending Balance | $ $ 9,074
Outstanding - vested and expected to vest Ending Balance | $ 9,074
Outstanding Ending Balance | $ $ 2,091