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
Revenue	$ 236,916	$ 238,683	$ 641,576	$ 546,605
Cost of revenue	143,844	185,306	489,586	442,127
Gross profit	93,072	53,377	151,990	104,478
Operating expenses
Technology and development	22,452	18,801	60,687	50,421
Marketing	12,421	8,361	47,611	68,611
General and administrative(1)	21,190	18,779	68,539	57,881
Total operating expenses	56,063	45,941	176,837	176,913
Income (loss) from operations	37,009	7,436	(24,847)	(72,435)
Interest income	319	1,576	1,859	5,804
Interest expense	(2,522)	(2,274)	(7,631)	(6,564)
Other income (expense), net	(640)	44	(1,943)	172
Net income (loss)	34,166	6,782	(32,562)	(73,023)
Dividend on convertible preferred stock	(1,530)	0	(2,814)	0
Undistributed earnings attributable to participating securities	(653)	0	0	0
Net income (loss) attributable to common stock - basic	31,983	6,782	(35,376)	(73,023)
Net income (loss) attributable to common stock - diluted	$ 31,983	$ 6,782	$ (35,376)	$ (73,023)
Net income (loss) attributable to common stock - basic (in dollars per share)	$ 0.32	$ 0.07	$ (0.36)	$ (0.80)
Weighted average shares - basic (in shares)	99,840,144	91,994,731	97,365,122	91,279,086
Net income (loss) attributable to common stock - diluted (in dollars per share)	$ 0.30	$ 0.07	$ (0.36)	$ (0.80)
Weighted average shares of common stock - diluted (in shares)	107,607,711	97,171,270	97,365,122	91,279,086
Other comprehensive income (loss)
Net loss	$ 34,166	$ 6,782	$ (32,562)	$ (73,023)
Foreign currency translation adjustments	6	(10)	(16)	28
Unrealized gain (loss) on available-for-sale securities	(139)	(8)	282	(2)
Total comprehensive income (loss)	34,033	6,764	(32,296)	(72,997)
GovernmentCreditForEmployeeRetention	56		1,348
COVID-19 [Member]
Other comprehensive income (loss)
Restructuring Costs	321		7,846
Service
Revenue	217,280	158,519	469,893	405,160
Cost of revenue	122,583	104,397	314,842	297,320
Product
Revenue	19,636	80,164	171,683	141,445
Cost of revenue	$ 21,261	$ 80,909	$ 174,744	$ 144,807