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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2012
Fair Value of Financial Instruments  
Schedule of estimated fair values of financial instruments outstanding

 

 

 

 

September 30, 2012

 

 

 

Cost

 

Unrealized
Gains

 

Unrealized
Losses

 

Fair
Value

 

Cash and cash equivalents

 

$

5,967

 

$

—

 

$

—

 

$

5,967

 

Short-term investments:

 

 

 

 

 

 

 

 

 

U.S. government debt securities

 

$

10,628

 

$

4

 

$

—

 

$

10,632

 

Corporate notes and commercial paper

 

14,403

 

15

 

(1

)

14,417

 

Certificates of deposit

 

5,156

 

3

 

—

 

5,159

 

Total short-term investments

 

$

30,187

 

$

22

 

$

(1

)

$

30,208

 

Long-term investments:

 

 

 

 

 

 

 

 

 

U.S. government debt securities

 

$

6,770

 

$

2

 

$

—

 

$

6,772

 

Corporate notes

 

2,074

 

2

 

—

 

2,076

 

Certificates of deposit

 

240

 

1

 

—

 

241

 

Total long-term investments

 

$

9,084

 

$

5

 

$

—

 

$

9,089

 

 

 

 

December 31, 2011

 

 

 

Cost

 

Unrealized
Gains

 

Unrealized
Losses

 

Fair
Value

 

Cash and cash equivalents

 

$

40,025

 

$

—

 

$

—

 

$

40,025

 

Short-term investments:

 

 

 

 

 

 

 

 

 

U.S. government debt securities

 

$

4,834

 

$

2

 

$

—

 

$

4,836

 

Corporate notes

 

4,578

 

1

 

(2

)

4,577

 

Total short-term investments

 

$

9,412

 

$

3

 

$

(2

)

$

9,413

 

Long-term investments:

 

 

 

 

 

 

 

 

 

U.S. government debt securities

 

$

5,721

 

$

1

 

$

(1

)

$

5,721

 

Corporate notes

 

2,816

 

2

 

(2

)

2,816

 

Total long-term investments

 

$

8,537

 

$

3

 

$

(3

)

$

8,537

 

 
Schedule of cost and fair value of investments based on maturity groups

 

 

 

 

September 30, 2012

 

 

 

Cost

 

Unrealized
Gains

 

Unrealized
Losses

 

Fair
Value

 

Due within 1 year

 

$

30,187

 

$

22

 

$

(1

)

$

30,208

 

Due in 1-2 years

 

9,084

 

5

 

—

 

9,089

 

Total

 

$

39,271

 

$

27

 

$

(1

)

$

39,297

 

 

 

 

December 31, 2011

 

 

 

Cost

 

Unrealized
Gains

 

Unrealized
Losses

 

Fair
Value

 

Due within 1 year

 

$

9,412

 

$

3

 

$

(2

)

$

9,413

 

Due in 1-2 years

 

8,537

 

3

 

(3

)

8,537

 

Total

 

$

17,949

 

$

6

 

$

(5

)

$

17,950

 

 
Schedule of fair value hierarchy for financial assets (cash equivalents and investments)

 

 

 

 

September 30, 2012

 

 

 

Fair Value

 

Level 1

 

Level 2

 

Level 3

 

Money market funds

 

$

1,445

 

$

1,445

 

$

—

 

$

—

 

Certificates of deposit

 

5,400

 

—

 

5,400

 

—

 

Corporate notes and commercial paper

 

20,019

 

—

 

20,019

 

—

 

U.S. government debt securities

 

17,905

 

—

 

17,905

 

—

 

Total assets

 

$

44,769

 

$

1,445

 

$

43,324

 

$

—

 

 

 

 

December 31, 2011

 

 

 

Fair Value

 

Level 1

 

Level 2

 

Level 3

 

Money market funds

 

$

2,792

 

$

2,792

 

$

—

 

$

—

 

Corporate notes

 

7,393

 

—

 

7,393

 

—

 

U.S. government debt securities

 

10,557

 

—

 

10,557

 

—

 

Total assets

 

$

20,742

 

$

2,792

 

$

17,950

 

$

—