Allowance for Doubtful Accounts Receivable and Sales Returns (Activity in Allowance for Doubtful Accounts Receivable and Sales Returns) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 629
Ending Balance	297	$ 629
Allowance for Doubtful Accounts Receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	598	484
Addition (reduction) to allowance	(319)	117
Amounts written off	0	(30)
Effects of foreign currency translation	(13)	27
Ending Balance	266	598
Allowance for Sales Returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	31	32
Addition (reduction) to allowance	0	(1)
Ending Balance	$ 31	$ 31