Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,310	$ 100
Other comprehensive income:
Foreign currency translation adjustments net of zero tax	2,065	688
Unrealized gains (losses) on available-for-sale securities, net of zero tax	28	(3)
Total other comprehensive loss	2,093	685
Comprehensive loss	$ 4,403	$ 785