Annual report pursuant to Section 13 and 15(d)

Timeline Labs Acquisition and Loss on Impairment - Additional Information (Detail)

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Timeline Labs Acquisition and Loss on Impairment - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 02, 2016
Aug. 03, 2015
Feb. 02, 2015
Feb. 29, 2016
Jan. 31, 2016
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Feb. 28, 2015
Business Acquisition [Line Items]                  
Payments to acquire business           $ 11,686,000   $ 4,009,000  
Contingent consideration liability, fair value         $ 0 0     $ 3,200,000
Acquisition of Timeline Labs           15,787,000      
Loss on impairment         21,500,000 21,464,000      
Severance and restructuring charges           1,061,000 $ 3,623,000 $ 911,000  
Timeline Labs [Member]                  
Business Acquisition [Line Items]                  
Percentage of equity interest acquired     100.00%            
Payments to acquire business     $ 14,186,000            
Indemnification assets     $ 1,400,000            
Business acquisition, number of common stock issued   260,537 344,055            
Common stock deposited into escrow     173,265            
Business acquisition, value of common stock issued   $ 1,800,000 $ 4,959,000            
Contingent consideration liability, fair value         $ 0 0      
Loss on impairment due to reversal of contingent consideration liability           400,000      
Acquisition of Timeline Labs     $ 15,800,000            
Business acquisition related costs           100,000      
Loss on impairment           $ 21,900,000      
Timeline Labs [Member] | Subsequent Event [Member]                  
Business Acquisition [Line Items]                  
Business acquisition, number of common stock issued 542,274                
Business acquisition, value of common stock issued $ 3,200,000                
Severance and restructuring charges       $ 700,000