	As of
	June 27, 2021		December 31, 2020
	(In thousands)
Raw materials	$	10,809	$	7,756
Finished goods		240,955		164,356
Total	$	251,764	$	172,112

The Company records provisions for excess and obsolete inventory based on assumptions about future demand and market conditions and the amounts incurred were $1.1 million and $2.3 million for the three and six months ended June 27, 2021, respectively, and $2.2 million and $4.6 million for the three and six months ended June 28, 2020, respectively. While management believes the estimates and assumptions underlying its current forecasts are reasonable, there is risk that additional charges may be necessary if current forecasts are greater than actual demand.

	As of
	June 27, 2021			December 31, 2020
	(In thousands)
Computer equipment	$	9,618		$	10,550
Furniture, fixtures and leasehold improvements		18,168			18,674
Software		29,695			29,499
Machinery and equipment		72,072			72,156
Total property and equipment, gross		129,553			130,879
Accumulated depreciation		(115,336	)		(114,799	)
Total	$	14,217		$	16,080

Depreciation expense pertaining to property and equipment was $2.9 million and $6.0 million for the three and six months ended June 27, 2021, respectively, and $3.2 million and $6.2 million for the three and six months ended June 28, 2020, respectively.

	As of June 27, 2021							As of December 31, 2020
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(In thousands)
Technology	$	59,799	$	(58,049	)	$	1,750	$	59,799	$	(57,835	)	$	1,964
Customer contracts and relationships		56,800		(56,800	)		—		56,800		(55,534	)		1,266
Other		10,345		(9,911	)		434		10,345		(9,676	)		669
Total	$	126,944	$	(124,760	)	$	2,184	$	126,944	$	(123,045	)	$	3,899

Amortization of purchased intangibles was $0.2 million and $1.7 million for the three and six months ended June 27, 2021, respectively, and $1.6 million and $3.2 million for the three and six months ended June 28, 2020, respectively.

	As of
	June 27, 2021		December 31, 2020
	(In thousands)
Non-current deferred income taxes	$	61,223	$	68,323
Long-term investments		10,053		8,395
Other		6,220		6,032
Total	$	77,496	$	82,750

The Company's long-term investments are comprised of equity investments without readily determinable fair values, investments in convertible debt and investments in limited partnership funds. The changes in the carrying value of equity investments without readily determinable fair values during the periods represented were as follows:

	Six Months Ended
	June 27, 2021		June 28, 2020
	(In thousands)
Carrying value as of the beginning of the period ⁽¹⁾	$	7,758	$	8,147
Additions from purchase of investments		340		5,815
Impairment		—		(4,530	)
Carrying value as of the end of the period ⁽¹⁾	$	8,098	$	9,432

⁽¹⁾The balances excluded an investment in limited partnership funds of $0.6 million, $0.4 million and $0.6 million as of June 27, 2021, June 28, 2020 and December 31, 2020, respectively. Additionally, the balance as of June 27, 2021 excluded an investment in convertible debt of $1.3 million.

For the equity investments without readily determinable fair values as of June 27, 2021, cumulative downward adjustments for price changes and impairment was $7.9 million and cumulative upward adjustments for price changes was $0.2 million.

	As of
	June 27, 2021		December 31, 2020
	(In thousands)
Current operating lease liabilities	$	8,894	$	9,149
Sales and marketing		99,597		83,561
Warranty obligations		7,180		9,240
Sales returns⁽¹⁾		57,897		66,972
Freight and duty		13,567		14,885
Other		35,768		34,568
Total	$	222,903	$	218,375

⁽¹⁾Inventory expected to be received from future sales returns amounted to $28.0 million and $32.6 million as of June 27, 2021 and December 31, 2020, respectively. Provisions to write down expected returned inventory to net realizable value amounted to $16.5 million and $18.0 million as of June 27, 2021 and December 31, 2020, respectively.