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Allowance for Doubtful Accounts Receivable and Sales Returns
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Allowance for Doubtful Accounts Receivable and Sales Returns
Note 6.
Allowance for Doubtful Accounts Receivable and Sales Returns
Activity in the allowance for doubtful accounts receivable (in thousands):
 
 
Years ended December 31,
 
 
2017
 
2016
 
2015
Balance, beginning of year
 
$
633

 
$
765

 
$
1,288

Addition (reduction) to allowance
 
(14
)
 
36

 
(355
)
Amounts written off
 
—

 
(152
)
 
(77
)
Effects of foreign currency translation
 
106

 
(16
)
 
(91
)
Balance, end of year
 
$
725

 
$
633

 
$
765

Activity in the allowance for sales returns (in thousands):
 
 
Years ended December 31,
 
 
2017
 
2016
 
2015
Balance, beginning of year
 
$
169

 
$
158

 
$
354

Addition (reduction) to allowance
 
55

 
15

 
(186
)
Amounts written off
 
(11
)
 
(3
)
 
(9
)
Effects of foreign currency translation
 
(1
)
 
(1
)
 
(1
)
Balance, end of year
 
$
212

 
$
169

 
$
158

Total, Allowance for Doubtful Accounts Receivable and Sales Returns
 
$
937

 
$
802

 
$
923


One customer accounted for 20% of trade accounts receivable at December 31, 2017. Three customers comprised more than 10% of our trade accounts receivable as of December 31, 2016, with the customers individually accounting for 25%, 16% and 12%.
One customer accounted for 10% or $8.0 million, of consolidated revenue during the year ended December 31, 2017, in our Mobile Services segment.
One customer accounted for 11%, or $9.1 million, of consolidated revenue during the year ended December 31, 2016, which is reflected in our Mobile Services segment.
No customer accounted for ten percent or more of our consolidated revenue during the year ended December 31, 2015.