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(5) STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Operating expenses:
Research and development	$ 397	$ 324	$ 1,061	$ 473
General and administrative	1,583	427	2,712	624
Total stock-based compensation expense	$ 1,980	$ 751	$ 3,773	$ 1,097
Impact on basic and diluted net loss per common share	$ 0.01	$ 0.00	$ 0.02	$ 0.01