Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Foreign currency forward Contract			$ 0	$ 0
Unrealized loss	$ (18,000)	$ (1,000)
Realized loss	$ (107,000)	$ (250,000)