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Stock-Based Compensation - Summary of Grants of Performance Based Restricted Stock Units Associated with Non-Employee (Detail) - Performance Based Restricted Stock Units [Member] - Non-employee [Member] - $ / shares
Jul. 14, 2016
Jan. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted Stock Units Awarded [1] 11,549  
Vesting Period 3 years  
Granted on July 14, 2016 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Price Per Share [2]   $ 18.47
[1] Amounts represent the maximum number of common stock shares that could be earned if certain performance targets are met as defined in the related restricted stock unit agreements.
[2] The respective grant was unvested at the end of our reporting period. Accordingly, the price per share represents the closing price of our common stock on January 27, 2019, the end of our reporting period.