Loan facility - Schedule of Loan Facility (Detail) (USD $)	3 Months Ended	12 Months Ended	123 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Debt Disclosure [Abstract]
Beginning balance	$ 2,286,489
Accrued interest	9,844
Bank loan cash received - October 30, 2013		2,500,000
Accretion of warrant discount	213,511
Warrant discount		(226,255)
Repayment fee and penalty	100,000		100,000
Financing costs		12,744
Repayment of bank loan and interest	(2,609,844)
Ending balance		$ 2,286,489