Related Party Transactions - Additional Information (Detail) (Consulting services [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Consulting services [Member]
Related Party Transaction Due From To Related Party [Line Items]
Outstanding payables due to related party	$ 16,000		$ 16,000		$ 6,000
Transaction expenses incurred by parent company	$ 37,000	$ 48,000	$ 66,000	$ 102,500