Segment Information - Schedule of Reconciliation Between Reportable Segment Gross Profit to Consolidated Loss Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Segment gross profit	$ 25,445	$ 15,671	$ 51,439	$ 41,528
Selling, general and administrative expenses	61,127	50,934	167,418	131,209
Depreciation and amortization	1,191	1,517	3,239	4,551
Interest expense	2,259	3,797	6,382	9,903
Interest income	(1,289)	(1,190)	(3,960)	(4,454)
Revaluation of preferred stock warrant		373	20,470	515
Other income, net	(26)	(44)	(111)	(75)
Loss before provision for income taxes	$ (37,817)	$ (39,716)	$ (141,999)	$ (100,121)