Condensed Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues		$ 106,896	$ 77,130	$ 208,359	$ 158,390
Operating expenses:
Cost of revenues (excluding depreciation and amortization)	[1]	42,212	29,296	81,184	59,825
General and administrative expenses	[1]	65,907	17,327	85,039	36,120
Selling and marketing expenses	[1]	82,845	16,842	103,415	36,090
Research and development expenses	[1]	26,503	8,161	36,287	16,884
Depreciation and amortization		11,235	10,497	21,352	20,038
Acquisition related expenses		329	1,156	1,036	3,091
Restructuring expenses		150	498	437	1,691
Total operating expenses		229,181	83,777	328,750	173,739
Loss from operations		(122,285)	(6,647)	(120,391)	(15,349)
Interest expense		1,402	4,382	4,363	8,725
Other (incomes) / expenses, net		(749)	(471)	535	(358)
Gain on extinguishment of debt		(10,000)		(10,000)
Change in fair value of warrants and derivative liabilities		(18,600)	4,100	5,000	6,700
Total other (incomes) / expenses		(27,947)	8,011	(102)	15,067
Loss before income taxes		(94,338)	(14,658)	(120,289)	(30,416)
Income tax provision / (benefit)		584	396	(993)	1,018
Net loss		(94,922)	(15,054)	(119,296)	(31,434)
Other comprehensive loss:
Foreign currency translation adjustment		(129)	(47)	(75)	(788)
Total comprehensive loss		(95,051)	(15,101)	(119,371)	(32,222)
Net loss per share
Net loss		(94,922)	(15,054)	(119,296)	(31,434)
Cumulative redeemable convertible preferred stock dividends		3,166	3,716	7,060	7,376
Net loss available to common stockholders		$ (98,088)	$ (18,770)	$ (126,356)	$ (38,810)
Basic loss per share		$ (1.92)	$ (0.58)	$ (3.01)	$ (1.19)
Diluted loss per share		$ (1.92)	$ (0.58)	$ (3.01)	$ (1.19)
Weighted average number of shares used to compute net loss per share
Basic		51,202,335	32,362,610	41,973,595	32,607,382
Diluted		51,202,335	32,362,610	41,973,595	32,607,382

[1] The Company recorded the total stock-based compensation expense as follows: