Organization - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011		Dec. 31, 2010
Organization and Nature of Operations [Line Items]
Number of products			1
Sales of product manufactured by a third party	$ 61	$ 5	$ 192	$ 19
Cash and cash equivalents	0	1	0	1	15	[1]	13
Third Party [Member]
Organization and Nature of Operations [Line Items]
Sales of product manufactured by a third party			$ 176

[1] Derived from audited information