Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ (18,530)	$ (15,827)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	27	(8)
Foreign currency translation	11	32
Total other comprehensive income (loss), net of tax	38	24
Total comprehensive income (loss)	$ (18,492)	$ (15,803)