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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
Changes in the allowance for doubtful accounts
Changes in the allowance for doubtful accounts for the years ended December 31, 2012 and 2011 are as follows: 
 
 
2012
 
2011
Balance, beginning of year
 
$
6

 
$
5

Additions
 
1

 
2

Deductions
 
—

 
(1
)
Balance, end of year
 
$
7

 
$
6