Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (28,395)	$ 13,744	$ (47,550)	$ (2,074)
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities, net of income tax expense of $33 thousand, $0, and $33 thousand, $0 for the three and six months ended June 30, 2019 and 2018, respectively.	100	0	100	0
Foreign currency translation adjustments	228	(2,269)	(162)	(1,876)
Other comprehensive income (loss)	328	(2,269)	(62)	(1,876)
Total comprehensive (loss) income	$ (28,067)	$ 11,475	$ (47,612)	$ (3,950)