Total Net Sales Based on Disaggregation Criteria (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Total net sales	$ 83,755	$ 78,142
Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	78,512	73,714
Over Time
Disaggregation Of Revenue [Line Items]
Total net sales	5,243	4,428
Americas
Disaggregation Of Revenue [Line Items]
Total net sales	61,365	60,153
Americas | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	56,461	55,906
Americas | Over Time
Disaggregation Of Revenue [Line Items]
Total net sales	4,904	4,247
Europe and the Middle East
Disaggregation Of Revenue [Line Items]
Total net sales	11,417	9,943
Europe and the Middle East | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	11,078	9,785
Europe and the Middle East | Over Time
Disaggregation Of Revenue [Line Items]
Total net sales	339	158
Asia-Pacific
Disaggregation Of Revenue [Line Items]
Total net sales	10,973	8,046
Asia-Pacific | Point-in-Time
Disaggregation Of Revenue [Line Items]
Total net sales	$ 10,973	8,023
Asia-Pacific | Over Time
Disaggregation Of Revenue [Line Items]
Total net sales		$ 23