Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 10,477	$ 8,759
Less accumulated depreciation and amortization	(7,701)	(6,159)
Property and equipment, net	2,776	2,600
Computer equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	734	618
Capitalized software
Property Plant And Equipment [Line Items]
Property and equipment, gross	674	463
Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,852	3,690
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 4,217	$ 3,988