Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Consolidated Statements of Operations
Revenue	$ 218,805,000	$ 118,291,000	$ 580,718,000	$ 311,481,000
Cost of sales	52,759,000	30,020,000	147,574,000	79,822,000
Gross margin	166,046,000	88,271,000	433,144,000	231,659,000
Operating expenses:
Research and development	34,945,000	17,631,000	97,164,000	47,278,000
General and administrative	80,565,000	46,729,000	208,329,000	121,861,000
Sales and marketing	86,196,000	64,836,000	265,325,000	172,675,000
Total operating expenses	201,706,000	129,196,000	570,818,000	341,814,000
Loss from operations	(35,660,000)	(40,925,000)	(137,674,000)	(110,155,000)
Other income (expense)
Investment income	9,093,000	6,292,000	23,417,000	14,882,000
Interest expense	(13,209,000)	(10,704,000)	(47,911,000)	(25,817,000)
Total other expense	(4,116,000)	(4,412,000)	(24,494,000)	(10,935,000)
Net loss before tax	(39,776,000)	(45,337,000)	(162,168,000)	(121,090,000)
Income tax benefit (expense)	(683,000)	(27,000)	230,000	(85,000)
Net loss	$ (40,459,000)	$ (45,364,000)	$ (161,938,000)	$ (121,175,000)
Net loss per share-basic and diluted (in dollars per share)	$ (0.31)	$ (0.37)	$ (1.26)	$ (0.99)
Weighted average common shares outstanding-basic and diluted (in shares)	129,567	122,671	128,344	121,946