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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013 and 2012 are as follows: 
 
 
2013
 
2012
Balance, beginning of year
 
$
7

 
$
6

Additions
 
1

 
1

Deductions
 
(1
)
 
—

Balance, end of year
 
$
7

 
$
7