Fair Value Measurements (Schedule of Company Financial Assets and Liabilities at Fair Value on Recurring Basis) (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investment	$ 18,210	$ 21,931
Available for sale securities	5,705	4,794
Contingent consideration		(4,705)
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investment	18,210	21,931
Available for sale securities	5,705	4,794
Contingent consideration		0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investment	0	0
Available for sale securities	0	0
Contingent consideration		0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investment	0	0
Available for sale securities	$ 0	0
Contingent consideration		$ (4,705)