Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2022

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Allowances for Accounts Receivable

The allowances for accounts receivable consisted of the following:

	March 31, 2022		December 31, 2021
Credit loss provision	$	16	$	26
Credit allowances		33		38
Total allowances	$	49	$	64

Summary of Allowance for credit losses

The following table summarizes the allowance for credit losses activity during the three months ended March 31, 2022:

Balance at December 31, 2021	$	26
Current period benefit for credit losses		(10	)
Balance at March 31, 2022	$	16

Summary of Inventories, Net

Inventories, net consisted of the following:

	March 31, 2022		December 31, 2021
Raw materials	$	5,879	$	6,171
Work-in-process		808		690
Finished goods		6,165		6,830
Inventories, net	$	12,852	$	13,691

Summary of Property and Equipment

Property and equipment consisted of the following:

	March 31, 2022			December 31, 2021
Building	$	6,922		$	6,892
Computers and office equipment		10,474			10,604
Manufacturing and test equipment		16,536			16,305
Furniture and fixtures		1,460			1,455
Leasehold improvements		3,012			3,021
Motor vehicles		20			20
Total property and equipment		38,424			38,297
Less: Accumulated depreciation and amortization		(28,704	)		(28,118	)
Land		1,770			1,770
Property and equipment, net	$	11,490		$	11,949

Summary of Accrued Liabilities

Accrued liabilities consisted of the following:

	March 31, 2022		December 31, 2021
Inventory receipts	$	2,704	$	4,302
Paid time off		1,452		1,284
Payroll and other employee benefits		1,284		2,266
Deferred revenues		625		538
Employee stock purchase plan		503		253
Operating leases		495		475
Income and sales taxes		433		415
Professional fees and contractors		360		233
Warranties		253		257
Customer refunds for estimated returns		232		248
Real estate taxes		195		156
Finance leases		53		62
Restructuring		0		368
Other		364		260
Total	$	8,953	$	11,117

Summary of Long-term Liabilities

Long-term liabilities consisted of the following:

	March 31, 2022		December 31, 2021
Operating leases	$	3,463	$	3,600
Finance leases		81		92
Deferred revenue		183		181
Other		93		126
Total	$	3,820	$	3,999