Condensed Consolidated Statements of Comprehensive Loss - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 110,141,000	$ 79,893,000
Cost of revenue	107,388,000	74,197,000
Gross profit	2,753,000	5,696,000
Operating expenses
Technology and development	15,556,000	12,762,000
Marketing	33,201,000	13,336,000
General and administrative	21,448,000	16,772,000
Total operating expenses	70,205,000	42,870,000
Loss from operations	(67,452,000)	(37,174,000)
Interest income	2,316,000	577,000
Interest expense	(2,136,000)	0
Other income, net	92,000	158,000
Net loss	$ (67,180,000)	$ (36,439,000)
Net loss per share - basic and diluted (in dollars per share)	$ (0.74)	$ (0.44)
Weighted average shares - basic and diluted (in shares)	90,610,416	82,010,913
Foreign currency translation adjustments	$ 1,000	$ 0
Total comprehensive loss	(67,179,000)	(36,439,000)
Service
Revenue	88,768,000	76,841,000
Cost of revenue	84,395,000	70,855,000
Product
Revenue	21,373,000	3,052,000
Cost of revenue	$ 22,993,000	$ 3,342,000