Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense

Income tax (expense) benefit for the periods presented consisted of the following:

	Years Ended December 31,
	2015			2014			2013
Current:
Federal	$	(140,987	)	$	(19,476	)	$	(7	)
State		(3,875	)		(1,496	)		(108	)
Total current		(144,862	)		(20,972	)		(115	)
Deferred:
Federal		8,179			36,917			—
State		90			313			—
Total deferred		8,269			37,230			—
Total income tax (expense) benefit	$	(136,593	)	$	16,258		$	(115	)

Schedule of Reconciliation of Statutory Federal Income Tax Rate

A reconciliation of the statutory Federal income tax rate of 35% to the Company’s effective income tax rates is as follows:

	Years Ended December 31,
	2015			2014			2013
Federal tax provision at statutory rate		35.0	%		35.0	%		35.0	%
State taxes (net of Federal benefit)		0.6	%		0.4	%		1.4	%
Stock-based compensation		0.1	%		0.1	%		(0.2	%)
Non-deductible officer compensation		0.2	%		0.1	%		(1.8	%)
Change in valuation allowance		—			(40.5	%)		(52.1	%)
Research and development credits		(0.2	%)		(1.5	%)		17.1	%
Other		0.1	%		0.2	%		0.3	%
Effective income tax rate		35.8	%		(6.2	%)		(0.3	%)

Schedule of Company's Deferred Tax Assets

Significant components of the Company’s deferred tax assets for Federal and state income taxes are follows:

	December 31,
	2015			2014
Deferred tax assets:
Deferred revenue	$	—		$	1,005
Net operating loss carryforward		8,257			9,100
Stock-based compensation		35,482			26,000
Tax credits		8,076			12,098
Intangible assets		9,833			5,259
Accruals and reserves		19,156			15,247
Total deferred tax assets		80,804			68,709
Less: valuation allowance		(16,827	)		(16,023	)
Total net deferred tax assets		63,977			52,686
Deferred tax liabilities
Depreciation		(3,168	)		(2,741	)
Convertible Notes		—			(12,792	)
Contingent consideration		(3,798	)		—
Total deferred tax liabilities		(6,966	)		(15,533	)
Net deferred tax assets	$	57,011		$	37,153
Recorded as:
Net current deferred tax assets	$	—		$	21,987
Net non-current deferred tax assets		57,011			15,176
Net non-current deferred tax liabilities (included in “Other    non-current liabilities”)		—			(10	)
Net deferred tax assets	$	57,011		$	37,153

Schedule of Gross Unrecognized Tax Positions

The following table summarizes activity related to the Company’s gross unrecognized tax positions:

	December 31,
	2015			2014			2013
Balance as of beginning of year	$	12,367		$	5,955		$	4,602
Additions based on tax positions related to the current year		2,898			6,439			702
Additions based on tax position related to prior year		135			—			660
Decreases based on tax positions related to prior year		(1,324	)		(27	)		(9	)
Balance as of end of year	$	14,076		$	12,367		$	5,955