SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Maximum short term interest reset period for auction rate securities	90 days
Minimum period for contractual maturities	10 years
Reset period frequency	Seven to twenty-eight days
Period for converting instruments into cash	1 year
Depreciation and amortization expense	$ 1,064	$ 1,172	$ 1,425
Number of operating segments	1
Gain on auction rate securities	113	20	4,362
Loss on auction rate securities put option			(5,074)
Cash grants			$ 978
Fair value valuation method	Black-Scholes option-pricing model