Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

v3.7.0.1
Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
May 05, 2017
May 05, 2016
Jul. 31, 2017
Jul. 31, 2016
May 04, 2016
Jul. 31, 2017
Jul. 31, 2016
Jan. 31, 2017
Business Acquisition [Line Items]                
Payments to acquire business             $ 5,243,000  
Operating loss     $ (2,083,000) $ (11,668,000)   $ (7,551,000) $ (21,243,000)  
DCC Labs [Member]                
Business Acquisition [Line Items]                
Percentage of equity interest acquired   100.00%            
Payments to acquire business, paid in shares   $ 2,640,000            
Net purchase price of acquired business   7,883,000            
Payments to acquire business   5,243,000            
Cash held in escrow $ 300,000 $ 500,000            
Shares initially held in escrow 227,090 681,278            
Business acquisition date           May 05, 2016    
Acquisition, goodwill identified $ 7,300              
Operating loss         $ 1,200,000      
Business acquisition related costs               $ 200,000