Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The components of the benefit from income taxes were as follows:

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Federal:
Current	$	(152	)	$	(191	)	$	14
Deferred	5,283			105			(86		)
	5,131			(86		)	(72		)
Foreign:
Current	59			1,719			7,281
Deferred	—			—			(1,696		)
	59			1,719			5,585
State:
Current	(131		)	(403		)	509
Deferred	1,264			93			(204		)
	1,133			(310		)	305
	$	6,323		$	1,323		$	5,818

Schedule of Income before Income Tax, Domestic and Foreign

The components of income (loss) from continuing operations before income taxes were as follows:

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Domestic	$	(104,106	)	$	(25,580	)	$	6,990
Foreign	—			(12		)	59
	$	(104,106	)	$	(25,592	)	$	7,049

Schedule of Effective Income Tax Rate Reconciliation

The benefit for income taxes varied from the federal statutory income tax rate due to the following:

	Year Ended December 31,
	2015		2014		2013
Federal statutory rate	35.0	%	35.0	%	35.0	%
State taxes, net of federal benefit	1.0	%	(0.5	)%	(8.1	)%
Foreign losses not benefited	—	%	—	%	(0.3	)%
Changes in tax reserves	(0.3	)%	0.2	%	(78.6	)%
Change in valuation allowance	(24.8	)%	30.3	%	(28.1	)%
Permanent differences	(4.7	)%	(64.6	)%	(1.8	)%
Foreign tax refund	—	%	6.5	%	—	%
Other	(0.1	)%	(1.7	)%	(0.6	)%
	6.1	%	5.2	%	(82.5	)%

Schedule of Deferred Tax Assets and Liabilities

The components of the deferred tax assets and liabilities were as follows:

	December 31,
	2015			2014
	(in thousands)
Deferred tax assets
Net operating loss carryforwards	$	45,296		$	49,096
Research and development credits	33,484			33,484
Marketable securities	19,266			—
Compensatory and other accruals	1,827			2,698
Unrealized losses on investments	—			5,265
Intangible assets	6,847			819
Foreign tax credits	—			201
Other, net	6,152			3,725
Gross deferred tax assets	112,872			95,288
Deferred tax liabilities:
Unrealized gains on investments	97			—
Fixed assets	20,073			19,128
Gross deferred tax liabilities	20,170			19,128
Net deferred tax asset before valuation allowance	92,702			76,160
Valuation Allowance	(93,439		)	(78,018		)
Net deferred tax liability	$	(737	)	$	(1,858	)

Schedule of Unrecognized Tax Benefits Roll Forward

The changes in unrecognized tax positions were as follows:

	Year Ended December 31,
	2015			2014			2013
	(in thousands)
Balance at beginning of period	$	19,076		$	19,121		$	26,419
Tax positions related to prior year:
Additions	8,269			—			—
Expiration of statute of limitations	(59		)	(45		)	(7,298		)
Settlements	—			—			—
Balance at ending of period	$	27,286		$	19,076		$	19,121