Certain Balance Sheet Components - Inventories, Property and Equipment, Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Inventories:
Raw materials	$ 10,731	$ 14,099
Work-in-process	4,347	4,250
Finished goods	49,192	52,300
Total inventories, net	64,270	70,649
Property and equipment:
Furniture and fixtures	7,856	6,706
Machinery and equipment	108,262	97,916
Leasehold improvements	7,612	7,079
Property, Plant and Equipment Gross, Total	123,730	111,701
Less: accumulated depreciation and amortization	(85,608)	(71,232)
Property and equipment, net	38,122	40,469
Accrued liabilities:
Accrued compensation	10,890	10,915
Accrued incentive compensation	7,403	7,917
Accrued warranty	4,292	5,558
Other	19,830	22,506
Accrued liabilities, Total	$ 42,415	$ 46,896