Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (78,764)	$ (28,578)	$ (13,844)
Other comprehensive income (loss):
Unrealized income (loss) on marketable securities, net of tax	21	48	(27)
Gains (losses) on marketable securities reclassified into earnings, net of tax	5	(27)	0
Total	26	21	(27)
Unrealized income (loss) on marketable securities, net of tax	3,510	(7,531)	3,291
Losses (gains) on derivative instruments reclassified into earnings, net of tax	(352)	3,741	(2,649)
Total	3,158	(3,790)	642
Total other comprehensive income (loss)	3,184	(3,769)	615
Comprehensive loss	$ (75,580)	$ (32,347)	$ (13,229)