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

As of December 31, 2011

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair
Value

Municipal obligations

$

1,158

$

51

$

—

$

1,209

U.S. government securities funds

988

—

(5

)

983

Short-term deposits

3,104

—

—

3,104

Equity securities

227

159

(5

)

381

Total short-term investment securities

$

5,477

$

210

$

(10

)

$

5,677