Schedule of Inventories at Cost Net of Reserves (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Inventory [Line Items]
Raw materials	$ 2,949	$ 3,146
Work in progress	7,331	10,828
Finished goods	1,282	1,621
Inventory at cost	11,562	15,595
Inventory reserves	(7,237)	(4,671)
Total	$ 4,325	$ 10,924