As of September 30, 2013

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair
Value

Municipal obligations

$

504

$

15

$

—

$

519

U.S. government securities funds

997

—

(11

)

986

Equity securities

227

351

(3

)

575

Total short-term investment securities

$

1,728

$

366

$

(14

)

$

2,080

As of December 31, 2012

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair
Value

Municipal obligations

$

608

$

30

$

—

$

638

U.S. government securities funds

995

—

(9

)

986

Equity securities

227

228

(8

)

447

Total short-term investment securities

$

1,830

$

258

$

(17

)

$

2,071