Income Taxes - Summary of Components of Net Deferred Tax Liabilities and Related Valuation Allowance(Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Amortization of intangibles	$ 12,130	$ 0
Deferred revenue	39,594	0
Derivative liability	1,267	0
Tax credit carryforwards	2,737	0
Net operating loss carryforwards and credits	1,247	23,927
Stock based compensation	2,493	1,606
Accrued expenses and other	636	(183)
Total deferred tax assets	60,104	25,350
Less valuation allowance	(39,605)	(25,350)
Total deferred tax assets	20,499	0
Deferred tax liabilities:
Depreciation	(900)	0
Investment in common stock	(35,995)	0
Marketable securities	(32,945)	0
Other		(1,709)
Net deferred tax liabilities	$ (49,341)	$ (1,709)