Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Loss before Income Tax Provision and Income Tax Expense

Loss before provision for income taxes and the provision for income taxes consist of the following for the years ended December 31, 2015, 2014 and 2013:

In thousands	2015			2014			2013
Loss before provision for income taxes
Domestic	$	(182,246	)	$	(100,860	)	$	(192,998	)
Foreign		(52,304	)		(61,112	)		(80,721	)
Total	$	(234,550	)	$	(161,972	)	$	(273,719	)
Benefit from (provision for) income taxes
Current:
State	$	(262	)	$	(237	)	$	(216	)
Foreign		(930	)		(393	)		(223	)
Deferred:
Federal		4,586			—			—
Total	$	3,394		$	(630	)	$	(439	)

Reconciliation of Federal Statutory Corporate Income Tax Rate to Effective Income Tax Rate

A reconciliation of the federal statutory corporate income tax rate to the effective income tax rate for the years ended December 31, 2015, 2014 and 2013 is as follows:

	2015			2014			2013
Statutory federal income tax rate		(35	)%		(35	)%		(35	)%
State income tax rate, net of federal benefit		(2	)		(4	)		(2	)
Tax benefit from unrealized gain		(2	)		—			—
Other permanent differences		2			(5	)		—
Foreign rate differential		6			9			9
Change in valuation allowance		30			35			28
Effective tax rate		(1	)%		—	%		—	%

Components of Deferred Income Taxes

The components of deferred income taxes were as follows at December 31:

In thousands	2015			2014
Deferred tax liabilities:
Lease items	$	2,958		$	377
Unrealized gain		4,586			—
Total deferred tax liabilities		7,544			377
Deferred tax assets:
Net operating loss carryforwards		254,601			205,793
Federal and state tax credit carryovers		36,870			32,318
Depreciation		3,773			4,383
Stock-based compensation		14,431			12,803
Tax Credits		36,424			9,008
Debt-related deductions		757			934
Total deferred tax assets		346,856			265,239
Deferred tax assets, net		339,312			264,862
Valuation allowance		(339,312	)		(264,862	)
Total deferred taxes	$	—		$	—

Estimated Net Operating Loss and Research and Development Credit Carryforwards

At December 31, 2015, the Company had available estimated net operating loss carryforwards and research and development credit carryforwards for federal, foreign and state tax reporting purposes as follows:

	Amount		Expiring if not utilized
	(in thousands)
Net operating loss carryforwards:
Federal	$	661,063		2020 through 2036
State	$	292,111		2020 through 2036
Foreign	$	266,024		2020 through 2022
Research and development credit carryforwards:
Federal	$	32,348		2019 through 2036
State	$	6,718		2020 through 2036

Reconciliation of Reserve for Uncertain Tax Benefits

A reconciliation of the reserve for uncertain tax benefits (including state tax matters without federal benefits) is as follows:

In thousands	2015		2014
Uncertain tax positions, beginning of the year:	$	24,984	$	24,653
Gross increases – tax positions in current period		501		331
Uncertain tax positions, end of year	$	25,485	$	24,984