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Investments in Marketable Securities (Tables)
 6 Months Ended
Jul. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities
As of July 31, 2017, investments in marketable securities consisted of the following (in thousands):
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Marketable securities
 
 
 
 
 
 
 
    Commercial paper
$
15,386

 
$
—

 
$
(10
)
 
$
15,376

    Corporate bonds
79,060

 
5

 
(55
)
 
79,010

Total marketable securities
$
94,446

 
$
5

 
$
(65
)
 
$
94,386
Schedule of Fair Value of Marketable Securities by Remaining Contractual Maturity
The fair values of marketable securities, by remaining contractual maturity, as of July 31, 2017, were as follows (in thousands):
Due within 1 year
$
48,496

Due in 1 year through 2 years
45,890

Total marketable securities
$
94,386
Schedule of Investment Income
Investment income is presented below (in thousands):
 
Three months ended July 31,
 
Six months ended July 31,
 
2017
 
2016
 
2017
 
2016
Interest income
$
322

 
$
14

 
322

 
$
26

Total investment income
$
322

 
$
14

 
$
322

 
$
26