SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property and equipment
Depreciation expense	$ 985	$ 411	$ 230
Patent Costs
Estimated useful life of patents	5 years
Accrued clinical trial costs related to site payments	$ 400	$ 400
Laboratory equipment | Minimum
Property and equipment
Estimated Useful Life	3 years
Laboratory equipment | Maximum
Property and equipment
Estimated Useful Life	5 years
Office and computer equipment
Property and equipment
Estimated Useful Life	3 years
Furniture and fixtures
Property and equipment
Estimated Useful Life	3 years