Short-Term Bank Borrowings (Parenthetical) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Short-term bank borrowings	$ 5,805,069	$ 5,760,618
Short Term Loan One
Short-term Debt [Line Items]
Short-term bank borrowings	0	5,760,618
Short Term Loan Two
Short-term Debt [Line Items]
Short-term bank borrowings	5,805,069	$ 0
Guarantee Type, Other | Short Term Loan One
Short-term Debt [Line Items]
Short-term bank borrowings	$ 40,000,000
Percentage of face value as handling fee	1.28%
Debt Instrument, Maturity Date	Mar. 20, 2017
Guarantee Type, Other | Short Term Loan Two
Short-term Debt [Line Items]
Short-term bank borrowings	$ 40,000,000
Percentage of face value as handling fee	1.28%
Debt Instrument, Maturity Date	Mar. 19, 2018