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Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
 
2016
 
2015
 
2014
Balance, beginning of year
 
$
765

 
$
1,288

 
$
966

Addition (reduction) to allowance
 
36

 
(355
)
 
433

Amounts written off
 
(152
)
 
(77
)
 
—

Effects of foreign currency translation
 
(16
)
 
(91
)
 
(111
)
Balance, end of year
 
$
633

 
$
765

 
$
1,288

Activity in the allowance for sales returns (in thousands):
 
 
Years ended December 31,
 
 
2016
 
2015
 
2014
Balance, beginning of year
 
$
158

 
$
354

 
$
569

Addition (reduction) to allowance
 
15

 
(186
)
 
(209
)
Amounts written off
 
(3
)
 
(9
)
 
(6
)
Effects of foreign currency translation
 
(1
)
 
(1
)
 
—

Balance, end of year
 
$
169

 
$
158

 
$
354

Total, Allowance for Doubtful Accounts Receivable and Sales Returns
 
$
802

 
$
923

 
$
1,642