RELATED PARTY TRANSACTIONS (Details) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2011 Carl A. Pelzel	Jun. 30, 2011 Carl A. Pelzel	Dec. 31, 2013 Burrill Securities Maximum
Related party transactions
Amount paid to related party under the separation agreement				$ 520,000
Period of base salary for payments under the separation agreement				1 year
Period over which payments were made to related party				1 year
Period for which health and dental insurance COBRA premiums of related party were paid				18 months
Accelerated vesting period of options				3 months
One-time severance charge					1,000,000
Stock-based compensation related to the accelerated vesting	6,108,000	5,070,000	3,869,000		400,000
Severance expense related to future payments and health care benefits					600,000
Amount of fee paid						$ 500,000