Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (15,840)	$ 2,284
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of tax of $0 for the three months ended March 31, 2017 and 2016	(4)	64
Foreign currency translation adjustments	97	27
Other comprehensive income	93	91
Comprehensive income (loss)	$ (15,747)	$ 2,375