Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Taxes

Schedule of reconciliation of the statutory U.S. federal rate to the Company's effective tax rate

	Years ended December 31,
	2014 (Restated)		2013		2012
Percent of pre-tax income:
U.S. federal statutory income tax rate	35.0	%	35.0	%	35.0	%
State taxes, net of federal benefit	6.8	%	—		0.0	%
Permanent items	2.3	%	(2.2	)%	(1.0	)%
Research and development credit	—		2.7	%	1.0	%
Change in valuation allowance	(89.5	)%	(35.5	)%	(35.0	)%
Effective income tax rate	(45.4	)%	0.0	%	0.0	%

Schedule of components of income tax expense

	Years ended December 31,
	2014 (Restated)			2013		2012
Current:
Federal	$	29,505		$	—	$	—
State	11,440			—		—
Deferred:
Federal	(4,469		)	—		—
State	—			—		—
Income tax expense	$	36,476		$	—	$	—

Schedule of significant components of the Company's deferred tax assets/liabilities

	2014 (Restated)			2013
Deferred tax assets (liabilities)
Deferred revenue	$	120,611		$	16,667
License and technology payments	14,251			6,407
Share-based compensation	5,679			1,396
Accrued Expenses	442			—
Depreciation	(328		)	(7		)
Federal net operating loss carryforwards	—			30,084
State and local net operating loss carryforwards	—			5,026
Federal research and development credit carryforwards	—			2,966
State research and development credit carryforwards	—			1,483
Deferred income tax assets	140,655			64,022
Valuation allowance	(136,138		)	(64,022		)
Net deferred tax assets	$	4,517		$	—