Revenues and Long-Lived Assets by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 30, 2012	Sep. 28, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$ 38,986	$ 25,694	$ 97,208	$ 64,863
Long-lived assets	3,541		3,541		2,686
United States
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	29,976	19,994	72,531	48,996
Long-lived assets	3,341		3,341		2,539
Rest of Americas
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	1,369	621	4,448	3,522
Europe, Middle East and Africa
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	5,011	3,187	12,106	7,944
Asia Pacific
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	2,630	1,892	8,123	4,401
Other
Segment Reporting Revenue Reconciling Item [Line Items]
Long-lived assets	$ 200		$ 200		$ 147