Summary of Warrants and Related Information (Detail) - Warrant	6 Months Ended
	Jun. 30, 2015 $ / shares shares
Warrants
Beginning balance | shares	20,000
Ending balance | shares	20,000
Exercisable at June 30, 2015 | shares	20,000
Weighted-Average Exercise Price
Beginning balance	$ 6.65
Ending balance	6.65
Exercisable at June 30, 2015	$ 6.65