Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Foreign currency forward Contract			$ 0	$ 0
Unrealized loss	$ (113,000)	$ (114,000)
Realized loss	$ (75,000)	$ (326,000)