Other Receivables and Prepayments (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Other receivables	$ 80,776	$ 118,031
Utility deposits	79,759	79,548
Prepaid insurance	0	162,000
Less: Allowance for valuation and doubtful debts	0	0
Other receivables, deposits and prepayments	193,302	559,955
Prepaid research and development costs
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Prepayments	$ 32,767	$ 200,376