Quarterly report pursuant to Section 13 or 15(d)

TLL, LLC Acquisition and Loss on Impairment - Additional Information (Detail)

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TLL, LLC 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
May. 31, 2016
Apr. 30, 2016
Apr. 30, 2015
Jan. 31, 2016
Feb. 28, 2015
Business Acquisition [Line Items]                
Payments to acquire business           $ 11,686,000    
Contingent consideration liability, fair value             $ 0 $ 3,200,000
Severance and restructuring charges         $ 1,775,000 $ 212,000    
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 542,274 260,537 344,055          
Common stock deposited into escrow     173,265          
Business acquisition, value of common stock issued $ 3,200,000 $ 1,800,000 $ 4,959,000          
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  
Severance and restructuring charges         $ 600,000      
Timeline Labs [Member] | Subsequent Event [Member]                
Business Acquisition [Line Items]                
Business acquisition, number of common stock issued       70,473        
Business acquisition, value of common stock issued       $ 200,000