CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 8	$ (5,037)	$ 1,268	$ (16,514)
Other comprehensive income (loss):
Net unrealized gain (loss) on investments	1	(36)	53	(36)
Total other comprehensive income (loss)	1	(36)	53	(36)
Comprehensive income (loss)	$ 9	$ (5,073)	$ 1,321	$ (16,550)