Unaudited Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (19,225)	$ (16,987)	$ (74,978)	$ (64,114)
Other comprehensive income:
Unrealized income (loss) on marketable securities, net of tax	(103)	(13)	(57)	37
Income (loss) on marketable securities reclassified into earnings, net of tax	32	4	59	(2)
Total	(71)	(9)	2	35
Unrealized income (loss) on derivative instruments, net of tax	(1,944)	883	(807)	4,199
Realized income on derivative instruments, net of tax	2,271	0	4,742	0
Loss (income) on derivative instruments reclassified into earnings, net of tax	(127)	(361)	177	170
Total	200	522	4,112	4,369
Total other comprehensive income	129	513	4,114	4,404
Comprehensive loss	$ (19,096)	$ (16,474)	$ (70,864)	$ (59,710)