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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2019
Allowance for Doubtful Accounts [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,
 
2019
 
2018
 
2017
Balance, beginning of period
$
129

 
$
113

 
$
124

Charged to expense
659

 
570

 
469

Uncollected balances written off, net of recoveries
(637
)
 
(554
)
 
(480
)
Balance, end of period
$
151

 
$
129

 
$
113