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Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Activity in 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