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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended
May 26, 2017
May 10, 2017
May 26, 2017
Class of Stock [Line Items]      
Proceeds from additional equity offering   $ 17,000,000 $ 17,000,000
Public stock offering      
Class of Stock [Line Items]      
Common stock, shares issued (in shares)   4,000,000  
Sale of stock, price per share (in dollars per share)   $ 4.00  
Proceeds from additional equity offering   $ 14,700,000  
Over-allotment option      
Class of Stock [Line Items]      
Common stock, shares issued (in shares)   600,000  
Proceeds from additional equity offering $ 2,300,000    
Over allotment common stock options period (in shares)   30 days  
ATM issuance sales agreement      
Class of Stock [Line Items]      
Maximum value of shares for sale   $ 10,000,000.0