Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
May 31, 2010	Sep. 30, 2013	Sep. 30, 2012
Loss Contingencies [Line Items]
Operating Leases, Rent Expense		$ 246,000	$ 253,000
Property under sublease	6,000 square feet

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration