Total Net Sales Based on Disaggregation Criteria (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total net sales	$ 86,920	$ 83,755
Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	82,736	78,512
Over Time
Disaggregation Of Revenue [Line Items]
Total net sales	4,184	5,243
Americas
Disaggregation Of Revenue [Line Items]
Total net sales	58,302	61,365
Americas | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	54,491	56,461
Americas | Over Time
Disaggregation Of Revenue [Line Items]
Total net sales	3,811	4,904
Europe and the Middle East
Disaggregation Of Revenue [Line Items]
Total net sales	9,497	11,417
Europe and the Middle East | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	9,124	11,078
Europe and the Middle East | Over Time
Disaggregation Of Revenue [Line Items]
Total net sales	373	339
Asia-Pacific
Disaggregation Of Revenue [Line Items]
Total net sales	19,121	10,973
Asia-Pacific | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	$ 19,121	$ 10,973