
	As of December 31, 2023								As of December 31, 2022
	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value		Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
	(In thousands)
U.S. Treasuries	$	79,654	$	320	$	—	$	79,974	$	29,849	$	—	$	(149)	$	29,700


	As of December 31,
	2023		2022
	(In thousands)
Gross accounts receivable	$	65,693	$	66,383
Allowance for credit losses	(333)		(423)
Total	$	65,360	$	65,960

The following table provides a roll-forward of the allowance for credit losses that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected.


	Years Ended December 31,
	2023		2022		2021
	(In thousands)
Balance at the beginning of the period	$	423	$	337	$	519
Provision for (release of) expected credit losses	(90)		86		(182)
Balance at the end of the period	$	333	$	423	$	337


	As of December 31,
	2023		2022
	(In thousands)
Machinery and equipment	$	14,148	$	12,696
Software	15,639		15,606
Computer equipment	1,438		3,992
Leasehold improvements	4,661		4,657
Furniture and fixtures	2,544		2,554
Total property and equipment, gross	38,430		39,505
Accumulated depreciation	(33,669)		(32,169)
Total property and equipment, net (1)	$	4,761	$	7,336

(1) $1.0 million and $1.7 million property and equipment, net was included in the sublease arrangement for the San Jose office building as of December 31, 2023 and 2022, respectively.

Depreciation expense pertaining to property and equipment was $4.7 million, $4.8 million and $5.9 million for the years ended December 31, 2023, 2022 and 2021, respectively.

We have determined that no event occurred or circumstances changed during the year ended December 31, 2023 that would more likely than not reduce the fair value of goodwill below the carrying amount. No goodwill impairment was recognized in the years ended December 31, 2023, 2022 and 2021.


	As of December 31,
	2023		2022
	(In thousands)
Sales incentives	$	28,187	$	36,271
Sales returns	17,058		18,656
Compensation	13,278		15,556
Cloud and other costs	10,985		11,154
Other	18,701		17,218
Total	$	88,209	$	98,855