As of March 31, 2014

As of December 31, 2013

Gross

Accumulated
Amortization

Impairment

Net

Gross

Accumulated
Amortization

Impairment

Net

Patents (4-10 years)

$

1,914

$

(1,898

)

$

—   

$

16

$

1,914

$

(1,895

)

$

— 

$

19

Trademarks (6 years)

69

(69

)

— 

— 

69

(69

)

— 

— 

Other (4 to 6 years)

817

(668

)

— 

149

817

(653

)

— 

164

Total

$

2,800

$

(2,635

)

$

— 

$

165 

$

2,800

$

(2,617

)

$

— 

$

183

Goodwill (Indefinite life)

$

2,926

$

2,926

$

2,926

$

2,926