Balance Sheet Components (Tables)

Accounts receivable net, consist of the following:


	March 31, 2023		December 31, 2022
Accounts receivable, gross	$	7,955	$	10,124
Less: allowance for doubtful accounts	(38)		(77)
Accounts receivable, net	$	7,917	$	10,047

The following is the change in our allowance for doubtful accounts:


	Three Months Ended
	March 31,
	2023		2022
Balance at beginning of period	$	77	$	36
Additions charged (reductions credited)	(39)		27

Balance at end of period	$	38	$	63

Inventories consist of the following:

Property and equipment, net consists of the following:


	March 31, 2023		December 31, 2022
Gross carrying amount	$	24,514	$	20,792
Less: accumulated depreciation and amortization	(17,089)		(16,160)
Property and equipment, net	$	7,425	$	4,632

Accrued liabilities and current portion of long-term liabilities consist of the following:


	March 31, 2023		December 31, 2022
Accrued payroll and related liabilities	$	2,301	$	3,632
Operating lease liabilities, current	1,991		1,391
Current portion of accrued liabilities for asset financings	1,423		876
Deferred revenue	185		230
Accrued interest payable	140		246
Accrued commissions and royalties	56		210

Liability for warranty returns	22		15

Other	2,136		2,249
Accrued liabilities and current portion of long-term liabilities	$	8,254	$	8,849

The change in deferred revenue is as follows:


	Three Months Ended
	March 31,
	2023		2022
Deferred revenue:
Balance at beginning of period	$	230	$	50
Revenue deferred	90		250
Revenue recognized	(135)		(80)
Balance at end of period	$	185	$	220