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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of allowance for doubtful accounts
Activity in the allowance for doubtful accounts is summarized as follows for the years presented:

 
Year Ended December 31,
 
2014
 
2013
 
2012
Balance, beginning of period
$
19

 
$
14

 
$
16

Charged to expense
122

 
101

 
105

Uncollected balances written off, net of recoveries
(119
)
 
(96
)
 
(107
)
 
 
 
 
 
 
Balance, end of period
$
22

 
$
19

 
$
14