Accounts receivable are recorded at invoiced amounts with standard net terms that range between 30 and 90 days. The Company extends credit to its customers based on an evaluation of a customer’s financial condition and collateral is generally not required. The Company records reserves for credit losses and credit allowances that reduce the value of accounts receivable to fair value.

The allowances for accounts receivable consisted of the following:

The Company is exposed to credit losses primarily through the sale of products. The Company’s methodology for expected losses on accounts receivable uses historical collection experience, current and future economic market conditions, and a review of the current status of customers’ trade accounts receivable. Due to the short-term nature of accounts receivable, the estimate of the amount of accounts receivable that may not be collected is based on aging of the account receivable balances and the financial condition of customers. Additionally, specific allowance amounts are established to record the appropriate provision for customers that have a higher probability of default. The Company’s monitoring activities include timely account reconciliation, dispute resolution, payment confirmation, consideration of customers' financial condition and macroeconomic conditions. Balances are written off when determined to be uncollectible. The Company’s allowance for credit losses was $89 at September 30, 2022 and $26 at December 31, 2021.

Inventories are stated at the lower of cost or net realizable value and include material, labor and overhead costs using the first-in, first-out method of costing. Inventories as of September 30, 2022 and December 31, 2021 were composed of raw materials, work-in-process

and finished goods. The Company had consigned inventory with customers of $0.3 million and $0.4 million at September 30, 2022 and December 31, 2021, respectively. The Company records allowances to reduce the value of inventory to the lower of cost or net realizable value, including allowances for excess and obsolete inventory. Reserves for excess inventory are calculated based on an estimate of inventory in excess of normal and planned usage. Obsolete reserves are based on identification of inventory where the carrying value is above net realizable value. The allowance for inventory losses was $3.1 million at September 30, 2022 and $4.1 million at December 31, 2021.

Inventories, net consisted of the following:


	September 30, 2022		December 31, 2021
Raw materials	$	7,430	$	6,171
Work-in-process		1,275		690
Finished goods		8,025		6,830
Inventories, net	$	16,730	$	13,691

Prepaid assets are stated at cost and are amortized over the useful lives (up to one year) of the assets.

Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets. The Company depreciates computer equipment and software licenses over three to five years; office equipment, manufacturing and test equipment, and motor vehicles over five years; furniture and fixtures over seven years; and buildings over 30 years. Leasehold improvements are amortized over the shorter of the corresponding lease term or useful life. Depreciation expense and gains and losses on the disposal of property and equipment are included in cost of revenues and operating expenses in the condensed consolidated statements of operations. Maintenance and repairs are expensed as incurred.

Property and equipment consisted of the following:


	September 30, 2022			December 31, 2021
Building	$	6,922		$	6,892
Computers and office equipment		10,189			10,604
Manufacturing and test equipment		14,692			16,305
Furniture and fixtures		1,446			1,455
Leasehold improvements		1,965			3,021
Motor vehicles		20			20
Total property and equipment		35,234			38,297
Less: Accumulated depreciation and amortization		(26,704	)		(28,118	)
Land		1,770			1,770
Property and equipment, net	$	10,300		$	11,949

Depreciation and amortization expense was approximately $0.7 million and $0.8 million for the three months ended September 30, 2022 and 2021, respectively. Depreciation and amortization expense was approximately $2.2 million and $2.3 million for the nine months ended September 30, 2022 and 2021, respectively. Amortization for finance leases is included in depreciation and amortization expense. See Note 11 for information related to finance leases.

Accrued liabilities consisted of the following:


	September 30, 2022		December 31, 2021
Accrued receipts	$	3,230	$	4,302
Payroll and other employee benefits		2,822		2,266
Paid time off		1,343		1,284
Right of use assets		553		537
Employee stock purchase plan		471		253
Deferred revenues		441		538
Income and sales taxes		314		415
Warranties		309		257
Customer refunds for estimated returns		301		248
Professional fees and contractors		295		233
Real estate taxes		119		156
Restructuring		0		368
Other		420		260
Total	$	10,618	$	11,117

Long-term liabilities consisted of the following:


	September 30, 2022		December 31, 2021
Operating leases	$	3,252	$	3,600
Finance leases		60		92
Deferred revenue		190		181
Other		31		126
Total	$	3,533	$	3,999

September 30, 2022

December 31, 2021

Credit loss provision

Credit allowances

Total allowances