Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 8,759	$ 7,661
Less accumulated depreciation and amortization	(6,159)	(4,800)
Property and equipment, net	2,600	2,861
Computer equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	618	515
Capitalized software
Property Plant And Equipment [Line Items]
Property and equipment, gross	463	423
Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,690	3,224
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 3,988	$ 3,499