Summary of Warrants and Related Information (Detail) - Warrant	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Warrants
Outstanding | shares	20,000
Granted | shares	0
Canceled | shares	0
Exercised | shares	0
Expired/Forfeited | shares	0
Outstanding | shares	20,000
Exercisable at June 30, 2017 | shares	20,000
Weighted Average Exercise Price
Outstanding | $ / shares	$ 6.64
Granted | $ / shares	0
Canceled | $ / shares	0
Exercised | $ / shares	0
Expired/Forfeited | $ / shares	0
Outstanding | $ / shares	6.64
Exercisable at June 30, 2017 | $ / shares	$ 6.64