CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 27,185	$ (9,549)	$ 8,514	$ (26,723)
Net unrealized (loss) gain on marketable securities	(7)	(16)	27	(22)
Comprehensive income (loss)	$ 27,178	$ (9,565)	$ 8,541	$ (26,745)