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Marketable Securities
 3 Months Ended
Dec. 31, 2016
Marketable Securities [Abstract]  
Marketable Securities
Marketable Securities
The amortized cost and fair value of marketable securities as of December 31, 2016 and September 30, 2016 were as follows:

December 31, 2016

Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
881

 
$
—

 
$
(1
)
 
$
880

Commercial paper
11,972

 
—

 
(8
)
 
11,964

Corporate notes/bonds
34,839

 
—

 
(240
)
 
34,599

US government agency securities
2,402

 
—

 
(11
)
 
2,391


$
50,094

 
$
—

 
$
(260
)
 
$
49,834


September 30, 2016

Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(in thousands)
Certificates of deposit
$
681

 
$
—

 
$
—

 
$
681

Commercial paper
11,945

 
—

 
(20
)
 
11,925

Corporate notes/bonds
34,701

 
—

 
(100
)
 
34,601

US government agency securities
2,411

 
—

 
(2
)
 
2,409


$
49,738

 
$
—

 
$
(122
)
 
$
49,616



Our investment portfolio consists of certificates of deposit, commercial paper, corporate notes/bonds and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. All unrealized losses are due to changes in market interest rates, bond yields and/or credit ratings.
The following table presents our available-for-sale marketable securities by contractual maturity date, as of December 31, 2016 and September 30, 2016.

December 31, 2016
 
September 30, 2016

Amortized cost
 
Fair value
 
Amortized cost
 
Fair value
 
(in thousands)
 
(in thousands)
Due in one year or less
$
22,650

 
$
22,618

 
$
18,585

 
$
18,549

Due after one year through three years
27,444

 
27,216

 
31,153

 
31,067


$
50,094

 
$
49,834

 
$
49,738

 
$
49,616