Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jul. 15, 2014
Subsequent Event [Member]
Loss Contingencies [Line Items]
Severance payment		$ 1,000,000
Shareholders Suit [Member]
Loss Contingencies [Line Items]
Insurance premium paid before any losses covered	$ 250,000