Fair Value Measurements - Fair Value Liabilities Measured on Recurring Basis (Detail) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, Beginning Balance	$ 901
Fair value adjustments	(94)
Contingent consideration, Ending Balance	807
Zindagi [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, Beginning Balance	180
Contingent consideration, Ending Balance	180
PuzzleSocial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, Beginning Balance	721
Fair value adjustments	(94)
Contingent consideration, Ending Balance	$ 627