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Goodwill and Intangible Assets - Schedule of Components of Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Gross Value $ 15,474 $ 15,474
Accumulated Amortization (15,464) (15,450)
Net Carrying Value $ 10 $ 24
Developed Technology    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Useful Life [1] 2 years 6 months 2 years 6 months
Gross Value $ 14,273 $ 14,273
Accumulated Amortization $ (14,273) $ (14,273)
Trade name and other    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Useful Life [1] 6 years 10 months 24 days 6 years 10 months 24 days
Gross Value $ 1,201 $ 1,201
Accumulated Amortization (1,191) (1,177)
Net Carrying Value $ 10 $ 24
[1] From the date of acquisition