SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 6) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allocation of stock based compensation expense
Stock-based compensation expense	$ 2,525	$ 2,477	$ 6,229	$ 6,208
Cost of revenue
Allocation of stock based compensation expense
Stock-based compensation expense	86	64	108	225
Sales and marketing
Allocation of stock based compensation expense
Stock-based compensation expense	669	320	1,067	753
Research & development
Allocation of stock based compensation expense
Stock-based compensation expense	348	338	971	1,243
General and administrative
Allocation of stock based compensation expense
Stock-based compensation expense	$ 1,422	$ 1,755	$ 4,083	$ 3,987