Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 238,683	$ 140,255	$ 546,605	$ 362,791
Cost of revenue	185,306	97,950	442,127	269,576
Gross profit	53,377	42,305	104,478	93,215
Operating expenses
Technology and development	18,801	14,310	50,421	40,105
Marketing	8,361	8,236	68,611	36,006
General and administrative	18,779	16,470	57,881	48,532
Total operating expenses	45,941	39,016	176,913	124,643
Income (loss) from operations	7,436	3,289	(72,435)	(31,428)
Interest income	1,576	1,775	5,804	3,082
Interest expense	(2,274)	(1,610)	(6,564)	(1,610)
Other income, net	44	21	172	200
Net income (loss)	$ 6,782	$ 3,475	$ (73,023)	$ (29,756)
Net income (loss) per share - basic (in dollars per share)	$ 0.07	$ 0.04	$ (0.80)	$ (0.35)
Net income (loss) per share - diluted (in dollars per share)	$ 0.07	$ 0.04	$ (0.80)	$ (0.35)
Weighted average shares - basic (in shares)	91,994,731	87,743,223	91,279,086	84,327,266
Weighted average shares - diluted (in shares)	97,171,270	94,642,463	91,279,086	84,327,266
Foreign currency translation adjustments	$ (10)	$ 0	$ 28	$ 0
Unrealized loss on available-for-sale securities	(8)	0	(2)	0
Total comprehensive loss	6,764	3,475	(72,997)	(29,756)
Service
Revenue	158,519	128,905	405,160	339,403
Cost of revenue	104,397	86,294	297,320	245,490
Product
Revenue	80,164	11,350	141,445	23,388
Cost of revenue	$ 80,909	$ 11,656	$ 144,807	$ 24,086