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Accounts Receivable and Other Receivables
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Accounts Receivable and Other Receivables
Accounts Receivable and Other Receivables

Accounts receivable balances consisted of the following (in thousands):
 
December 31,
2017
 
December 31,
2016
Accounts receivable, gross
$
32,970

 
$
38,433

Less: allowance for doubtful accounts
(150
)
 
(55
)
Accounts receivable, net
$
32,820

 
$
38,378



Accounts receivable at December 31, 2017 and 2016 consisted of sales to the Company’s customers which are generally based on standard terms and conditions. The Company recorded the following activity in allowance for doubtful accounts (in thousands):
 
For the Years Ended
December 31,
2017
 
2016
 
2015
Allowance for doubtful accounts, beginning of the year
$
55

 
$
103

 
$
124

Charged to costs and expenses
153

 
(34
)
 
(17
)
Less: write-offs, net of recoveries
(58
)
 
(14
)
 
(4
)
Remaining allowance, end of the year
$
150

 
$
55

 
$
103



As of December 31, 2017 and 2016, other receivables were $3.4 million and $4.2 million. Other receivables consisted primarily of non-trade receivables including inventory sold to the Company's contract manufacturing partner or other integration partners, on which the Company does not recognize revenue, and net receivables for value-added taxes.