Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Schedule of Impact of Consolidated Statements of Cash Flows of Adopting ASC 606 (Detail)

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Revenue from Contracts with Customers - Schedule of Impact of Consolidated Statements of Cash Flows of Adopting ASC 606 (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Cash flows from operating activities:        
Net loss $ (9,080) $ (1,529) $ (14,551) $ (6,900)
Unbilled receivables     (2,335) 2,558
Prepaid expenses and other assets     (1,584) 8
Deferred revenues     (5,729) (870)
Other operating activities     2,430 230
Total cash used in operating activities     (19,416) $ (2,317)
Under ASC 605 [Member] | ASU 2014-09 [Member]        
Cash flows from operating activities:        
Net loss (10,470)   (18,334)  
Unbilled receivables     (2,119)  
Prepaid expenses and other assets     (949)  
Deferred revenues     (478)  
Other operating activities     111  
Total cash used in operating activities     (19,416)  
Adjustment [Member] | ASU 2014-09 [Member]        
Cash flows from operating activities:        
Net loss $ 1,390   3,783  
Unbilled receivables     (216)  
Prepaid expenses and other assets     (635)  
Deferred revenues     (5,251)  
Other operating activities     $ 2,319