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Accounts Receivable
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
The components of accounts receivable are as follows:
 
As of December 31,
 
2017
2016
Accounts receivable, gross
$
70,941

$
62,782

Less: Allowance for doubtful accounts
(357
)
(170
)
Accounts receivable, net
$
70,584

$
62,612