Other Receivables and Prepayments (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Prepaid insurance	$ 162,000	$ 123,250
Other receivables	118,031	24,675
Utility deposits	79,548	79,354
Recoverable input VAT	0	467,858
Less: Allowance for valuation and doubtful debts	0	0
Other receivables, deposits and prepayments	559,955	1,882,864
Prepaid research and development costs
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Prepayments	200,376	1,154,704
Other prepayments
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Prepayments	$ 0	$ 33,023