Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net loss	$ (1,889)	$ (2,741)	$ (5,533)	$ (6,351)
Available-for-sale investments
Net change in unrealized gain (loss) on available-for-sale investments	(13)	26	20	28
Less: Reclassification adjustment for gains on investments recognized during the year	(1)	(1)	(2)	(1)
Net change in unrealized gain (loss) on available-for-sale investments	(14)	25	18	27
Tax provision (benefit)	(5)	9	6	10
Other comprehensive income (loss), net of tax	(9)	16	12	17
Comprehensive loss	$ (1,898)	$ (2,725)	$ (5,521)	$ (6,334)