Fair Value Measurements - Fair Value Measurements on a Recurring and Non-Recurring Basis (Detail) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair value measurements on a recurring and non-recurring basis
Contingent consideration liability	$ (798)	$ (477)
Money market funds
Fair value measurements on a recurring and non-recurring basis
Money market funds	36
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value measurements on a recurring and non-recurring basis
Contingent consideration liability	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Fair value measurements on a recurring and non-recurring basis
Money market funds	36
Significant Other Observable Inputs (Level 2)
Fair value measurements on a recurring and non-recurring basis
Contingent consideration liability	0	0
Significant Other Observable Inputs (Level 2) | Money market funds
Fair value measurements on a recurring and non-recurring basis
Money market funds	0
Significant Unobservable Inputs (Level 3)
Fair value measurements on a recurring and non-recurring basis
Contingent consideration liability	(798)	$ (477)
Significant Unobservable Inputs (Level 3) | Money market funds
Fair value measurements on a recurring and non-recurring basis
Money market funds	$ 0