Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Loss on Impairment - Additional Information (Detail)

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Acquisitions and Loss on Impairment - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
May 05, 2016
Feb. 02, 2016
Aug. 03, 2015
Feb. 02, 2015
May 31, 2016
Oct. 31, 2016
Jul. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Jul. 31, 2016
Oct. 31, 2016
Oct. 31, 2015
Jan. 31, 2016
Feb. 28, 2015
Business Acquisition [Line Items]                            
Payments to acquire business                     $ 5,243,000 $ 11,686,000    
Acquisition, goodwill identified                     5,401,000      
Decrease in receivables                     (1,987,000) (895,000)    
Revenue           $ 19,961,000   $ 28,747,000     59,983,000 79,795,000    
Operating loss           (8,435,000)   (11,841,000)     (29,678,000) (26,057,000)    
Contingent consideration liability, fair value                         $ 0 $ 3,200,000
Severance and other restructuring charges           $ 2,373,000   $ 197,000     5,991,000 $ 1,026,000    
Timeline Labs [Member]                            
Business Acquisition [Line Items]                            
Percentage of equity interest acquired       100.00%                    
Net purchase price of acquired business       $ 22,639,000                    
Payments to acquire business       14,186,000                    
Acquisition, goodwill identified       15,800,000                    
Business acquisition related costs                         200,000  
Indemnification assets       $ 1,400,000                    
Business acquisition, number of common stock issued   542,274 260,537 344,055 70,473                  
Common stock deposited into escrow       173,265                    
Business acquisition, value of common stock issued   $ 3,200,000 $ 1,800,000 $ 4,959,000 $ 200,000                  
Loss on impairment due to reversal of contingent consideration liability                         400,000  
Loss on impairment                         $ 21,900,000  
Severance and other restructuring charges                   $ 600,000 600,000      
DCC Labs [Member]                            
Business Acquisition [Line Items]                            
Percentage of equity interest acquired 100.00%                          
Payments to acquire business, paid in shares $ 2,600,000                          
Cash held in escrow 500,000                          
Net purchase price of acquired business 7,883,000                          
Payments to acquire business 5,243,000                          
Acquisition, goodwill identified $ 5,400,000                          
Business acquisition date           May 05, 2016     May 05, 2016          
Decrease in receivables           $ 300,000                
Increase in goodwill           $ 300,000                
Revenue                 $ 700,000          
Operating loss                 $ 2,000,000          
Business acquisition related costs                     $ 200,000      
Severance and other restructuring charges             $ 1,900,000