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Allowance for Doubtful Accounts Receivable and Sales Returns
 12 Months Ended
Dec. 31, 2015
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,
 
 
2015
 
2014
 
2013
Balance, beginning of year
 
$
1,288

 
$
966

 
$
1,010

Addition (reduction) to allowance
 
(355
)
 
433

 
(2
)
Amounts written off
 
(77
)
 
—

 
(83
)
Effects of foreign currency translation
 
(91
)
 
(111
)
 
41

Balance, end of year
 
$
765

 
$
1,288

 
$
966

Activity in the allowance for sales returns (in thousands):
 
 
Years ended December 31,
 
 
2015
 
2014
 
2013
Balance, beginning of year
 
$
354

 
$
569

 
$
653

Addition (reduction) to allowance
 
(186
)
 
(209
)
 
(64
)
Amounts written off
 
(9
)
 
(6
)
 
(21
)
Effects of foreign currency translation
 
(1
)
 
—

 
1

Balance, end of year
 
$
158

 
$
354

 
$
569

Total, Allowance for Doubtful Accounts Receivable and Sales Returns
 
$
923

 
$
1,642

 
$
1,535


One customer accounted for 52% and one other customer accounted for 12% of trade accounts receivable as of December 31, 2015. One customer accounted for 21% and one other customer accounted for 15% of trade accounts receivable as of December 31, 2014.
One customer accounted for approximately 26% or $32.9 million, of consolidated revenue during the year ended December 31, 2015, in our Mobile Entertainment segment.
One customer accounted for 20%, or $31.9 million, of consolidated revenue during the year ended December 31, 2014, in our Mobile Entertainment segment.
One customer accounted for 13%, or $27.0 million, of consolidated revenue during the year ended December 31, 2013, in our RealPlayer and Games segments. One other customer accounted for 13%, or $26.4 million, of consolidated revenue during the year ended December 31, 2013, in our Mobile Entertainment segment.