Property, Equipment, and Related Depreciation - Estimated Useful Lives for Property (Detail)	9 Months Ended
	Dec. 31, 2012
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property	10 years
Minimum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property	3 years
Minimum [Member] | Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property	3 years
Minimum [Member] | Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property	3 years
Maximum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property	10 years
Maximum [Member] | Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property	10 years
Maximum [Member] | Computer hardware and software [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property	5 years