STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,598,000	$ 711,000
Unrecognized compensation costs related to unvested stock options	9,900,000
Unrecognized compensation cost related to non-vested RSA's	2,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term	4 years 9 months	4 years 9 months 18 days
Expected volatility (in hundredths)	78.10%	72.00%
Risk-free interest rate (in hundredths)	0.85%	1.02%
Expected dividend yield (in hundredths)	0.00%	0.00%
Weighted average grant date fair value (in dollars per share)	$ 10.18	$ 9.54
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of unrecognized costs	2 years 11 months 26 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of unrecognized costs	3 years 6 months
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	112,000	34,000
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	500,000	97,000
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	587,000	322,000
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 399,000	$ 258,000