Balance Sheet Details (Details 2)	9 Months Ended
	Sep. 30, 2012
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	10 years
Laboratory equipment [Member] | Maximum [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	5 years
Laboratory equipment [Member] | Minimum [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	3 years
Computer equipment [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	3 years
Furniture and fixtures [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	5 years
Machinery and equipment [Member] | Maximum [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	5 years
Machinery and equipment [Member] | Minimum [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	3 years
Office equipment [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	3 years
Software [Member]
Depreciation of property and equipment estimated useful life
Depreciation of property and equipment estimated useful life	3 years