Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Cash and Cash Equivalents and Investments

The Company’s cash and cash equivalents and investments consist of the following:

	December 31,		December 31,
	2021		2020
Cash	$	6,789	$	4,740
Cash equivalents		1,403		1,021
Short-term investments		22,562		30,582
Long-term investments		0		4,640
	$	30,754	$	40,983

Cash Equivalents and Investments Measured at Fair Value

Cash equivalents and Level 1 and Level 2 investments measured at fair value were as follows:

	December 31, 2021								December 31, 2020
	Level 1		Level 2			Total			Level 1			Level 2			Total
Cash equivalents:
Certificates of deposit	$	0	$	0		$	0		$	300		$	0		$	300
Money market funds		1,403		0			1,403			721			0			721
Total Cash Equivalents	$	1,403	$	0		$	1,403		$	1,021		$	0		$	1,021
Short-Term Investments:
Corporate bonds	$	0	$	19,659		$	19,659		$	0		$	26,318		$	26,318
Certificates of deposit		2,903		0			2,903			4,264			0			4,264
Total Short-Term Investments	$	2,903	$	19,659		$	22,562		$	4,264		$	26,318		$	30,582
Long-Term Investments:
Corporate bonds	$	0	$	0		$	0		$	0		$	4,382		$	4,382
Certificates of deposit		0		0			0			258			0			258
Total Long-Term Investments	$	0	$	0		$	0		$	258		$	4,382		$	4,640
Cash equivalents and Investments - book value	$	4,306	$	19,659		$	23,965		$	5,543		$	30,700		$	36,243
Unrealized (losses) gains	$	1	$	(2	)	$	(1	)	$	(1	)	$	(7	)	$	(8	)
Cash equivalents and Investments - fair value	$	4,307	$	19,657		$	23,964		$	5,542		$	30,693		$	36,235

Summary of Allowances for Accounts Receivable

The allowances for accounts receivable consisted of the following:

	December 31, 2021		December 31, 2020
Credit loss provision	$	26	$	66
Credit allowances		38		47
Total allowances	$	64	$	113

Summary of Allowance for Credit Losses

The following table summarizes the allowance for credit losses for the years ended December 31, 2021 and December 31, 2020:

	December 31, 2021			December 31, 2020
Beginning Balance	$	66		$	56
Current period benefit for credit losses		(40	)		(167	)
Recovery of amounts previously written off		0			177
Ending Balance	$	26		$	66

Summary of Inventories

Inventories consisted of the following:

	December 31, 2021		December 31, 2020
Raw materials	$	6,171	$	5,315
Work in process		690		883
Finished goods		6,830		3,786
Inventories, net	$	13,691	$	9,984

Summary of Property and Equipment

Property and equipment consisted of the following:

	December 31, 2021			December 31, 2020
Building	$	6,892		$	6,868
Computers and office equipment		10,604			10,039
Manufacturing and test equipment		16,305			15,394
Furniture and fixtures		1,455			1,437
Leasehold improvements		3,021			2,973
Motor vehicles		20			20
Total property and equipment		38,297			36,731
Less: Accumulated depreciation and amortization		(28,118	)		(25,996	)
Land		1,770			1,770
Property and equipment, net	$	11,949		$	12,505

Summary of Accrued Liabilities

Accrued liabilities consisted of the following:

	December 31, 2021		December 31, 2020
Inventory receipts	$	4,302	$	3,049
Payroll and other employee benefits		2,266		1,083
Paid time off		1,284		1,028
Deferred revenues		538		242
Operating leases		475		269
Income and sales taxes		415		185
Restructuring		368		15
Warranties		257		285
Employee stock purchase plan		253		224
Customer refunds for estimated returns		248		146
Professional fees and contractors		233		316
Real estate taxes		156		155
Finance leases		62		68
Other		260		251
Total	$	11,117	$	7,316

Summary of Long-term Liabilities

Long-term liabilities consisted of the following:

	December 31, 2021		December 31, 2020
Operating leases	$	3,600	$	3,949
Deferred payroll taxes		0		243
Finance leases		92		96
Deferred revenue		181		76
Other		126		23
Total	$	3,999	$	4,387