

Note 6.	Allowance for Doubtful Accounts Receivable and Sales Returns

Activity in the allowance for doubtful accounts receivable (in thousands):



	Years ended December 31,
	2014			2013			2012
Balance, beginning of year	$	966		$	1,010		$	1,445
Addition (reduction) to allowance	433			(2		)	76
Amounts written off	—			(83		)	(529		)
Effects of foreign currency translation	(111		)	41			18
Balance, end of year	$	1,288		$	966		$	1,010

Activity in the allowance for sales returns (in thousands):



	Years ended December 31,
	2014			2013			2012
Balance, beginning of year	$	569		$	653		$	668
Addition (reduction) to allowance	(209		)	(64		)	153
Amounts written off	(6		)	(21		)	(168		)
Effects of foreign currency translation	—			1			—
Balance, end of year	$	354		$	569		$	653
Total, Allowance for Doubtful Accounts Receivable and Sales Returns	$	1,642		$	1,535		$	1,663

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 17% of trade accounts receivable as of December 31, 2013.

One customer accounted for approximately 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.

One customer accounted for 11%, or $27.7 million, of consolidated revenue during the year ended December 31, 2012, in our RealPlayer and Games segments.