Related Party Transactions - Additional Information (Detail) (Consulting Services [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Consulting Services [Member]
Related Party Transaction Due From To Related Party [Line Items]
Outstanding payables due to related party	$ 37,000		$ 37,000		$ 6,000
Transaction expenses incurred by parent company	$ 59,000	$ 39,000	$ 125,000	$ 141,000