Allowance for Doubtful Accounts Receivable and Sales Returns (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019
Balance, beginning of year	$	484	$	475
Addition to allowance	117		24
Amounts written off	(30)		—
Effects of foreign currency translation	27		(15)
Balance, end of year	$	598	$	484

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

	Years ended December 31,
	2020		2019
Balance, beginning of year	$	32	$	85
Addition (reduction) to allowance	(1)		(32)
Amounts written off	—		(21)
Balance, end of year	$	31	$	32
Total, Allowance for Doubtful Accounts Receivable and Sales Returns	$	629	$	516