CERTAIN RISKS AND CONCENTRATION - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Concentration Risk [Line Items]
Number of customers with greater than ten percent revenue	3	2
Number of customers with greater than ten percent of total accounts receivable	2		2
Customer 1
Concentration Risk [Line Items]
Percentage of revenue by customer	29.30%	26.90%
Percentage of total accounts receivables	38.90%		48.50%
Customer 2
Concentration Risk [Line Items]
Percentage of revenue by customer	11.80%	10.30%
Percentage of total accounts receivables	11.00%		14.60%
Customer 3
Concentration Risk [Line Items]
Percentage of revenue by customer	11.10%