Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Effects of Adopting Topic 606 on Consolidated Statements of Cash Flows (Detail)

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Summary of Significant Accounting Policies - Summary of Effects of Adopting Topic 606 on Consolidated Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Cash flows from operating activities:    
Net income (loss) $ (38,002) $ 13,498
Unbilled receivables (2,468) 3,968
Prepaid expenses and other current assets (877) (588)
Deferred revenue (3,379) (1,078)
Other operating activities (173) 386
Total cash used in operating activities (21,524) $ 12,947
Adjustment [Member] | ASU 2014-09 [Member]    
Cash flows from operating activities:    
Net income (loss) (2,802)  
Unbilled receivables (1,557)  
Prepaid expenses and other current assets 554  
Deferred revenue 6,124  
Other operating activities (2,319)  
Balance Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]    
Cash flows from operating activities:    
Net income (loss) (40,804)  
Unbilled receivables (4,025)  
Prepaid expenses and other current assets (323)  
Deferred revenue 2,745  
Other operating activities (2,492)  
Total cash used in operating activities $ (21,524)