Income Taxes - Summary of Components of Net Deferred Tax Liabilities and Related Valuation Allowance(Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Amortization of intangibles	$ 32,032	$ 12,130
Deferred revenue	44,754	39,594
Derivative liability		1,267
Tax credit carryforwards	5,693	2,737
Net operating loss carryforwards and credits	6,237	1,247
Stock based compensation	3,898	2,493
Accrued expenses and other	1,558	636
Total deferred tax assets	94,172	60,104
Less valuation allowance	(81,039)	(39,605)
Total deferred tax assets	13,133	20,499
Deferred tax liabilities:
Amortization of intangibles	(25,433)	0
Depreciation	(1,530)	(900)
Investment in common stock	(39,408)	(35,995)
Marketable securities		(32,945)
Other	0	0
Net deferred tax liabilities	$ (53,238)	$ (49,341)