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Marketable Securities (Tables)
 3 Months Ended
Apr. 30, 2015
Investments Debt And Equity Securities [Abstract]  
Summary of Cash Equivalents and Marketable Securities

The following is a summary of our cash equivalents and marketable securities as of April 30, 2015 (in thousands).

 

 

 

April 30, 2015

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

Estimated

 

 

 

Cost

 

 

Gain

 

 

Loss

 

 

Fair Value

 

Corporate paper

 

$

62,496

 

 

$

10

 

 

$

(1

)

 

$

62,505

 

U.S. government agency obligations

 

 

20,295

 

 

 

1

 

 

 

(1

)

 

 

20,295

 

Corporate debt securities

 

 

15,518

 

 

 

4

 

 

 

(7

)

 

 

15,515

 

Asset-backed securities

 

 

15,335

 

 

 

1

 

 

 

(2

)

 

 

15,334

 

U.S. government obligations

 

 

12,037

 

 

 

—

 

 

 

(2

)

 

 

12,035

 

 

 

$

125,681

 

 

$

16

 

 

$

(13

)

 

$

125,684

 

Included in cash and cash equivalents

 

$

21,692

 

 

$

3

 

 

$

—

 

 

$

21,695

 

Included in marketable investments

 

$

103,989

 

 

$

13

 

 

$

(13

)

 

$

103,989

 

 
Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Contractual Maturity

The amortized cost and estimated fair value of our cash equivalents and marketable securities as of April 30, 2015 are shown below by contractual maturity (in thousands).

 

 

 

April 30, 2015

 

 

 

Amortized

 

 

Estimated

 

 

 

Cost

 

 

Fair Value

 

Less than one year

 

$

112,196

 

 

$

112,200

 

Due in one to five years

 

 

13,485

 

 

 

13,484

 

 

 

$

125,681

 

 

$

125,684