Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Common stock issued during the period, value $ 3,600  
Common stock, outstanding 22,364,000 21,352,000
Preferred stock authorized to issue 5,000,000  
Preferred stock, shares outstanding 0  
Chief Executive Officer    
Class of Stock [Line Items]    
Common stock issued during the period 850,000  
Chief Financial Officer    
Class of Stock [Line Items]    
Common stock issued during the period 150,000  
Chief Executive Officer and Chief Financial Officer    
Class of Stock [Line Items]    
Common stock issued during the period, value $ 3,600  
Common stock, outstanding 9,670,386  
Common stock share outstanding owned 43.00%