As of September 30, 2012

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair
Value

Municipal obligations

$

709

$

36

$

—

$

745

U.S. government securities funds

990

—

(4

)

986

Equity securities

227

240

(6

)

461

Total short-term investment securities

$

1,926

$

276

$

(10

)

$

2,192

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