Balance Sheet Details - Summary of Equipment and Improvements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Gross, Total	$ 23,059	$ 24,101
Less accumulated depreciation and amortization	(16,036)	(12,890)
Equipment and improvements, net	7,023	11,211
Computer hardware, software, and equipment [Member]
Property, Plant and Equipment [Line Items]
Gross, Total	16,529	16,122
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Gross, Total	5,317	6,368
Office furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Gross, Total	$ 1,213	$ 1,611