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Accounts Receivable
9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable 

The components of accounts receivable are as follows:
 
As of
 
September 30,
 
December 31,
 
2018
 
2017
Accounts receivable, gross
$
79,423

 
$
70,941

Less: Allowance for doubtful accounts
(393
)
 
(357
)
Accounts receivable, net
$
79,030

 
$
70,584