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Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Summary of Changes in Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts consisted of the following (in thousands):

 

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Balance as of beginning of year

 

$

487

 

 

$

1,090

 

 

$

754

 

Increase in allowance charged to expense

 

 

103

 

 

 

36

 

 

 

521

 

Accounts charged against the allowance, net of recoveries

 

 

(313

)

 

 

(639

)

 

 

(185

)

Balance as of end of year

 

$

277

 

 

$

487

 

 

$

1,090