Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016
Rising Tide [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum amount payable	$ 140,000,000			$ 140,000,000
Contingent consideration liability	1,400,000			1,400,000
Potential future payments maximum period			3 years
Rising Tide [Member] | Research and Development [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of contingent consideration liability	5,800,000
Zindagi [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of contingent consideration liability	0
Maximum amount payable	60,000,000			60,000,000
Contingent consideration liability	200,000			$ 200,000
Potential future payments maximum period		3 years		3 years
PuzzleSocial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum amount payable	42,000,000			$ 42,000,000
Contingent consideration liability	$ 400,000			$ 400,000
Potential future payments maximum period	2 years 6 months			2 years 6 months