CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3,854)	$ 1,260
Other comprehensive income:
Net unrealized gain on investments	101	52
Total other comprehensive income	101	52
Comprehensive income (loss)	$ (3,753)	$ 1,312