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Stockholders' Equity - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 25, 2017
May 26, 2017
May 24, 2017
May 10, 2017
Mar. 31, 2017
Jan. 27, 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]            
Sale of stock, price per share (in dollars per share)         $ 6.79  
Maximum value of shares for sale           $ 10,000,000.0
Proceeds from issuance ATM offering         $ 2,500,000  
Number of shares issued (in shares)         379,693  
Infinia Technology Corporation (ITC)            
Class of Stock [Line Items]            
Consideration transferred, excluding contingent consideration $ 3,800,000          
Business combination, stock issued (in shares) 884,890          
Business combination, cash paid $ 100,000