Schedule of Company Financial Assets and Liabilities at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	$ 21,931	$ 21,094
Available for sale securities	4,794	4,513
Contingent consideration	4,705
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	21,931	21,094
Available for sale securities	4,794	4,513
Contingent consideration	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	0	0
Available for sale securities	0	0
Contingent consideration	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market investments	0	0
Available for sale securities	0	$ 0
Contingent consideration	$ 4,705