Balance Sheet Components - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Product warranty period, minimum	1 year
Product warranty period, maximum	2 years
Restructuring charges	$ 325,000	[1]	$ 130,000
Restructuring obligation	$ 300,000

[1] Restated and Revised, see Note 2