Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Nature Of Operations [Line Items]
Percentage of revenue transacted in foreign currency			11.00%	9.00%
Percentage of expenses transacted in foreign currency			12.00%	21.00%
Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income			$ 200,000	$ (100,000)
Cash and cash equivalents maturities			90 days	90 days
Investment of cash equivalents are redeemable upon demand using amortized cost method			$ 1.00
Investment in money market funds restricted by investment in short term securities, percentage			100.00%
Short-term investments, maturities, minimum			90 days
Short-term investments, maturities, maximum			1 year
Long-term investments, maturities, minimum			1 year
Long-term investments, maturities, maximum			2 years
Net unrealized losses			$ 59,000	$ 1,000
Credit loss provision			92,000	26,000
Allowance for credit losses			92,000	26,000
Consigned inventory with customers			200,000	400,000
Allowance for inventory losses			3,100,000	4,100,000
Depreciation and amortization			2,800,000	3,000,000.0
Advertising expense			$ 200,000	300,000
Most likely than not benefit likelihood percentage being realized upon ultimate settlement with taxing authority resulting from sustainability of tax examination			50.00%
Deferred tax asset, valuation allowance			$ 14,275,000	15,258,000
Deferred payroll taxes			200,000	200,000
Impairment of long-lived assets			0	$ 0
Foreign Tax Authority [Member]
Nature Of Operations [Line Items]
Deferred tax asset, valuation allowance			$ 1,400,000
Test & Measurement Product Line [Member]
Nature Of Operations [Line Items]
Goodwill impairment test			October 31, 2022
Goodwill acquired	$ 5,800,000
Test & Measurement Product Line [Member] | Product [Member]
Nature Of Operations [Line Items]
Goodwill impairment test				October 31, 2021
Goodwill acquired		$ 6,300,000
Equipment [Member]
Nature Of Operations [Line Items]
Period over which assets are depreciated			5 years
Furniture and Fixtures [Member]
Nature Of Operations [Line Items]
Period over which assets are depreciated			7 years
Building [Member]
Nature Of Operations [Line Items]
Period over which assets are depreciated			30 years
Level 3 [Member]
Nature Of Operations [Line Items]
Investments			$ 0	$ 0
Cash [Member]
Nature Of Operations [Line Items]
Cash and cash equivalents in foreign bank			4,540,000	3,909,000
CHINA [Member] | Cash [Member]
Nature Of Operations [Line Items]
Cash and cash equivalents in foreign bank			2,672,000	2,800,000
U.S. and China [Member] | Foreign Tax Authority [Member]
Nature Of Operations [Line Items]
Deferred tax asset, valuation allowance			13,400,000
Sweden [Member] | Foreign Tax Authority [Member]
Nature Of Operations [Line Items]
Deferred tax asset, valuation allowance			900,000
Sweden [Member] | Cash [Member]
Nature Of Operations [Line Items]
Cash and cash equivalents in foreign bank			1,868,000	1,004,000
France [Member] | Cash [Member]
Nature Of Operations [Line Items]
Cash and cash equivalents in foreign bank			0	$ 105,000
Maximum [Member]
Nature Of Operations [Line Items]
Federal Deposit Insurance Corporation insured limit			$ 250,000
Standard term of accounts receivable			90 days
Useful lives of the assets			1 year
Maximum [Member] | Computer Equipment and Software License [Member]
Nature Of Operations [Line Items]
Period over which assets are depreciated			5 years
Minimum [Member]
Nature Of Operations [Line Items]
Standard term of accounts receivable			30 days
Minimum [Member] | Computer Equipment and Software License [Member]
Nature Of Operations [Line Items]
Period over which assets are depreciated			3 years