Summary of Stock Option Activities (Detail) (USD $)	1 Months Ended	6 Months Ended
	Feb. 13, 2011	Jun. 30, 2012
Number of Options
Outstanding at December 31, 2011		940,000
Granted	940,000
Exercised
Cancelled		(47,000)
Outstanding at June 30, 2012		893,000
Exercisable at June 30, 2012		178,600
Weighted Average Exercise Price
Outstanding at December 31, 2011		$ 9.75
Granted
Exercised
Cancelled		$ 9.75
Outstanding at June 30, 2012		$ 9.75
Exercisable at June 30, 2012		$ 9.75
Weighted Average Remaining Contractual Terms(years)
Outstanding at December 31, 2011		9 years 1 month 6 days
Outstanding at June 30, 2012		8 years 8 months 12 days
Exercisable at June 30, 2012		8 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding at December 31, 2011
Granted
Exercised
Cancelled
Outstanding at June 30, 2012			[1]
Exercisable at June 30, 2012

[1] Exercise price exceeds our market price at June 30, 2012.