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Investments in Marketable Securities
 12 Months Ended
Jan. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
The Company considers all of its investments in marketable securities as available for use in current operations, including those with maturity dates beyond one year, and therefore classifies these securities within current assets on the consolidated balance sheets. Marketable securities are carried at fair value, with the unrealized gains and losses, net of income taxes, reflected in accumulated other comprehensive income (loss) until realized. For the purposes of computing realized and unrealized gains and losses, cost is determined on a specific identification basis.
As of January 31, 2018, investments in marketable securities consisted of the following:
(in thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Commercial paper
$
10,972

 
$
—

 
$
(7
)
 
$
10,965

Corporate bonds
57,172

 
—

 
(243
)
 
56,929

U.S. treasury securities
16,150

 
—

 
(70
)
 
16,080

Total marketable securities
$
84,294

 
$
—

 
$
(320
)
 
$
83,974


As of January 31, 2018, the Company does not believe the unrealized losses represent other-than-temporary impairments based on its evaluation of available evidence, and no marketable securities have been in a continuous unrealized loss position for more than 12 months. As of January 31, 2017, the Company had no investments in marketable securities.
The Company's marketable securities have a contractual maturity of two years or less. As of January 31, 2018, the fair value of marketable securities by remaining contractual maturity consisted of the following:
(in thousands)
Fair Value
Due within 1 year
$
65,132

Due in 1 to 2 years
18,842

Total marketable securities
$
83,974


Interest income, realized gains, realized losses and other-than-temporary declines in fair value on securities available for sale are components of investment income. Investment income for the periods presented is as follows:
 
Fiscal year ended January 31,
(in thousands)
2018
 
2017
 
2016
Interest income
$
1,134

 
$
34

 
$
6

Realized gains
1

 
—

 
—

Total investment income
$
1,135

 
$
34

 
$
6


The Company had no realized losses or material reclassification adjustments out of accumulated other comprehensive loss into net loss in any of the periods presented.