Property and Equipment, Net - Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Property Plant And Equipment [Abstract]
Computer equipment and software	$ 4,247	$ 2,810
Machinery and equipment	2,112	2,050
Furniture and fixtures	413	397
Leasehold improvements	1,195	642
Construction in progress		827
Property and equipment, gross	7,967	6,726
Less: accumulated depreciation and amortization	(4,942)	(4,190)
Total property and equipment, net	$ 3,025	$ 2,536