7. Balance Sheet Details

Inventory consists of the following (in thousands):


	December 31, 2011		December 31, 2010

Raw materials	$	3,077	$	3,344
Finished goods		41,527		21,213

Total inventory	$	44,604	$	24,557

Accounts receivable, net consisted of the following (in thousands):


	December 31, 2011			December 31, 2010

Accounts receivable	$	49,180		$	44,545
Allowance for doubtful accounts		(402	)		(617	)
Product return reserve		(835	)		(551	)

Accounts receivable, net	$	47,943		$	43,377

Property and equipment, net, consisted of the following (in thousands):


	December 31, 2011			December 31, 2010

Computer equipment and purchased software	$	28,477		$	24,061
Test equipment		29,849			26,476
Furnitures and fixtures		1,480			1,560
Leasehold improvements		6,342			2,882

Total		66,148			54,979
Accumulated depreciation		(50,018	)		(43,164	)

Property and equipment, net	$	16,130		$	11,815

Accrued liabilities consisted of the following (in thousands):


	December 31, 2011		December 31, 2010

Accrued compensation and related benefits	$	12,406	$	13,376
Accrued warranty		12,104		3,789
Accrued professional and consulting fees		1,741		1,613
Accrued excess and obsolete inventory at contract manufacturers		3,784		1,022
Sales and use tax payable		861		1,066
Accrued customer rebates		1,549		1,880
Accrued other		3,769		3,241

Total accrued liabilities	$	36,214	$	25,987

As of December 31, 2011, accrued warranty, accrued excess and obsolete inventory and accrued other, include accruals related to the acquisition of Occam. For more information regarding the acquisition, see Note 2, "Acquisition of Occam Networks" in the Notes to Consolidated Financial Statements.