Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 772	$ (1,441)
Other comprehensive income (loss) components:
Foreign currency translation	940	228
Total other comprehensive income (loss)	940	228
Comprehensive income (loss)	$ 1,712	$ (1,213)