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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 05, 2017
Jun. 30, 2017
Mar. 30, 2017
Follow-on Public Offering [Member]      
Subsidiary, Sale of Stock [Line Items]      
Public offering price per share   $ 18  
Common Stock [Member] | Follow-on Public Offering [Member]      
Subsidiary, Sale of Stock [Line Items]      
Public offering price per share     $ 18.00
Proceeds from issuance of common stock net of underwriting discounts and before offering costs $ 86,224    
Common stock, shares issued 5,117,500 5,117,500  
Offering expenses paid $ 294    
Maximum [Member] | Common Stock [Member]      
Subsidiary, Sale of Stock [Line Items]      
Common stock, shares subscribed     5,117,500
Maximum [Member] | Common Stock [Member] | Underwriter's Over-Allotment [Member]      
Subsidiary, Sale of Stock [Line Items]      
Common stock, shares subscribed     667,500
Common stock, shares issued 667,500