Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019
Cash	$	4,740	$	5,604
Cash equivalents		1,021		1,490
Short-term investments		30,582		32,556
Long-term investments		4,640		0
	$	40,983	$	39,650

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, 2020									December 31, 2019
	Level 1			Level 2			Total			Level 1		Level 2			Total
Cash equivalents:
Corporate bonds	$	0		$	0		$	0		$	0	$	708		$	708
Certificates of deposit		300			0			300			0		0			0
Money market funds		721			0			721			782		0			782
Total Cash Equivalents	$	1,021		$	0		$	1,021		$	782	$	708		$	1,490
Short-Term Investments:
Corporate bonds	$	0		$	26,318		$	26,318		$	0	$	28,710		$	28,710
Certificates of deposit		4,264			0			4,264			3,846		0			3,846
Total Short-Term Investments	$	4,264		$	26,318		$	30,582		$	3,846	$	28,710		$	32,556
Long-Term Investments:
Corporate bonds	$	0		$	4,382		$	4,382		$	0	$	0		$	0
Certificates of deposit		258			0			258			0		0			0
Total Long-Term Investments	$	258		$	4,382		$	4,640		$	0	$	0		$	0
Cash equivalents and Investments - book value	$	5,543		$	30,700		$	36,243		$	4,628	$	29,418		$	34,046
Unrealized gains (losses)	$	(1	)	$	(7	)	$	(8	)	$	1	$	(11	)	$	(10	)
Cash equivalents and Investments - fair value	$	5,542		$	30,693		$	36,235		$	4,629	$	29,407		$	34,036

Summary of Allowances for Accounts Receivable

The allowances for accounts receivable consisted of the following:

	December 31, 2020		December 31, 2019
Credit losses provision	$	66	$	56
Credit allowances		47		48
Total allowances	$	113	$	104

Summary of Allowance for Credit Losses

The following table summarizes the allowance for credit losses activity during the year ended December 31, 2020:

Balance at December 31, 2019	$	56
Current period benefit for credit losses		(167	)
Recovery of amounts previously written off		177
Balance at December 31, 2020	$	66

Summary of Inventories

Inventories consisted of the following:

	December 31, 2020		December 31, 2019
Raw materials	$	5,315	$	6,502
Work in process		883		913
Finished goods		3,786		4,520
Inventories, net	$	9,984	$	11,935

Summary of Property and Equipment

Property and equipment consisted of the following:

	December 31, 2020			December 31, 2019
Building	$	6,868		$	6,389
Computers and office equipment		10,039			9,847
Manufacturing and test equipment		15,394			14,192
Furniture and fixtures		1,437			1,314
Leasehold improvements		2,973			2,850
Motor vehicles		20			20
Total property and equipment		36,731			34,612
Less: Accumulated depreciation and amortization		(25,996	)		(24,397	)
Land		1,770			1,770
Property and equipment, net	$	12,505		$	11,985

Summary of Accrued Liabilities

Accrued liabilities consisted of the following:

	December 31, 2020		December 31, 2019
Inventory receipts	$	3,049	$	1,431
Payroll and other employee benefits		1,083		1,654
Paid time off		1,028		855
Professional fees and contractors		316		246
Warranties		285		444
Operating leases		269		282
Deferred revenues		242		241
Employee stock purchase plan		224		228
Income and sales taxes		185		133
Real estate taxes		155		152
Customer refunds for estimated returns		146		147
Finance leases		68		77
Restructuring		15		45
Short-term incentive plan		0		2,504
Leasehold improvements		0		702
Other		251		241
Total	$	7,316	$	9,382

Summary of Long-term Liabilities

Long-term liabilities consisted of the following:

	December 31, 2020		December 31, 2019
Operating leases	$	3,949	$	3,021
Deferred payroll taxes		243		0
Finance leases		96		164
Deferred revenue		76		119
Other		23		11
Total	$	4,387	$	3,315