CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS [Abstract]
Net loss	$ (6,548)	$ (10,061)	$ (10,518)
Available-for-sale investments
Net change in unrealized gain (loss) on available-for-sale investments	959	723	(20)
Less Reclassification adjustment for (gains) losses on investments recognized during the year	(19)	(5)	(74)
Net change in unrealized gain (loss) on available-for-sale investments	940	718	(94)
Tax provision (benefit)	18	(197)	0
Other comprehensive income (loss), net of tax	922	915	(94)
Comprehensive loss	$ (5,626)	$ (9,146)	$ (10,612)