Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Gross Value	$ 15,551	$ 15,789
Accumulated Amortization	(3,639)	(3,059)
Net Value	11,912	12,730
Customer relationships [Member]
Goodwill [Line Items]
Gross Value	6,622	6,769
Accumulated Amortization	(939)	(766)
Net Value	5,683	6,003
Developed technology [Member]
Goodwill [Line Items]
Gross Value	6,306	6,397
Accumulated Amortization	(1,661)	(1,354)
Net Value	4,645	5,043
Intellectual property [Member]
Goodwill [Line Items]
Gross Value	2,340	2,340
Accumulated Amortization	(935)	(851)
Net Value	1,405	1,489
Trade names [Member]
Goodwill [Line Items]
Gross Value	270	270
Accumulated Amortization	(100)	(85)
Net Value	170	185
Other [Member]
Goodwill [Line Items]
Gross Value	13	13
Accumulated Amortization	(4)	(3)
Net Value	$ 9	$ 10