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Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
 
2018
 
2017
 
2016
Balance, beginning of year
 
$
725

 
$
633

 
$
765

Addition (reduction) to allowance
 
(224
)
 
(14
)
 
36

Amounts written off
 
—

 
—

 
(152
)
Effects of foreign currency translation
 
(26
)
 
106

 
(16
)
Balance, end of year
 
$
475

 
$
725

 
$
633

Activity in the allowance for sales returns (in thousands):
 
 
Years ended December 31,
 
 
2018
 
2017
 
2016
Balance, beginning of year
 
$
212

 
$
169

 
$
158

Addition (reduction) to allowance
 
(126
)
 
55

 
15

Amounts written off
 
—

 
(11
)
 
(3
)
Effects of foreign currency translation
 
(1
)
 
(1
)
 
(1
)
Balance, end of year
 
$
85

 
$
212

 
$
169

Total, Allowance for Doubtful Accounts Receivable and Sales Returns
 
$
560

 
$
937

 
$
802