Income Taxes (Tables)

12 Months Ended

Mar. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Income Before Income Tax

Loss from operations before income tax consists of the following (in thousands):

	Fiscal Years Ended March 31,
	2013			2012			2011
Loss from operations before income tax:
Domestic (loss) income	$	(130,552	)	$	(78,630	)	$	536
Foreign loss	(4,117		)	(3,130		)	(1,143		)
	$	(134,669	)	$	(81,760	)	$	(607	)

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense (benefit) from operations consists of the following (in thousands):

	Fiscal Years Ended March 31,
	2013			2012			2011
Current:
Federal	$	(1,106	)	$	147		$	(17	)
Foreign	847			1,034			285
State	(129		)	60			131
Total Current	(388		)	1,241			399
Deferred:
Foreign	(166		)	(313		)	—
State	—			—			—
Total Deferred	(166		)	(313		)	—
	$	(554	)	$	928		$	399

Schedule of Effective Income Tax Rate Reconciliation

The provision (benefit) for income taxes reconciles to the amount computed by applying the federal statutory rate (35%) to loss before income taxes as follows for operations (in thousands):

	Fiscal Years Ended March 31,
	2013					2012					2011
	$			%		$			%		$			%
Tax at federal statutory rate	$	(47,134	)	35	%	$	(28,613	)	35	%	$	(212	)	35	%
Tax benefit from loss from continuing operations	(925		)	1		(123		)	—		—			—
Other permanent differences	1,195			(1	)	2,295			(3	)	1,903			(314	)
State taxes, net of federal benefit	(7,263		)	5		(3,937		)	5		(30		)	5
Federal tax credits	(1,909		)	1		(4,131		)	5		(3,010		)	496
State tax credits	(537		)	—		(622		)	1		(409		)	67
Veloce accrued liability	26,749			(20	)	24,046			(29	)	—			—
Valuation allowance	28,715			(21	)	11,600			(14	)	1,441			(237	)
Change in contingency reserve	74			—		52			—		94			(15	)
Other	481			—		361			(1	)	622			(103	)
	$	(554	)	—	%	$	928		(1	)%	$	399		(66	)%

Schedule of Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities for federal and state income taxes are as shown below (in thousands):

	Fiscal Years Ended March 31,
	2013			2012
Deferred tax assets:
Net operating loss carryforwards	$	310,276		$	284,210
Research and development credit carryforwards	78,696			78,621
Inventory write-downs and other reserves	9,046			9,748
Capitalization of research and development costs	8,038			8,451
Goodwill	7,431			8,248
Intangible assets	40,201			46,681
Investment impairment	4,958			4,083
Stock-based compensation	31,177			26,975
Depreciation and amortization	165			—
Other	1,056			979
Total deferred tax assets	491,044			467,996
Deferred tax liabilities:
Depreciation and amortization	—			(2,402		)
Intangible assets	—			—
Net deferred tax asset	491,044			465,594
Valuation allowance	(490,629		)	(465,281		)
	$	415		$	313

Schedule of Unrecognized Tax Benefits Roll Forward

The following is a tabular reconciliation of the Unrecognized Tax Benefits activity during the fiscal year ended March 31, 2013 (in thousands):

Opening Balance	$	43,179
Gross decreases — tax positions in prior period	(773		)
Gross increases — current-period tax positions	976
Ending Balance	$	43,382