Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit​
Beginning balance (in shares) at Dec. 31, 2020		159,423,410
Beginning balance at Dec. 31, 2020	$ 2,235,552	$ 1,595	$ 4,279,327	$ 526	$ (2,045,896)
Increase (Decrease) in Stockholders' Equity
Settlement of convertible notes, net of tax (in shares)		344
Settlement of convertible notes, net of tax	26		26
Exercise of common stock options (in shares)		967,107
Exercise of common stock options	8,759	$ 10	8,749
Issuance of common stock to fund the Company's 401(k) match (in shares)		162,606
Issuance of common stock to fund the Company's 401(k) match	22,934	$ 2	22,932
Compensation expense related to issuance of stock options and restricted stock awards (in shares)		1,355,435
Compensation expense related to issuance of stock options and restricted stock awards	158,252	$ 13	158,239
Issuance of common stock for business combinations, net of issuance costs (in shares)		9,384,410
Issuance of common stock for business combinations, net of issuance costs	1,254,798	$ 94	1,254,704
Net loss	(31,164)				(31,164)
Other comprehensive income (loss)	(162)			(162)
Ending balance (in shares) at Mar. 31, 2021		171,293,312
Ending balance at Mar. 31, 2021	3,648,995	$ 1,714	5,723,977	364	(2,077,060)
Beginning balance (in shares) at Dec. 31, 2020		159,423,410
Beginning balance at Dec. 31, 2020	2,235,552	$ 1,595	4,279,327	526	(2,045,896)
Increase (Decrease) in Stockholders' Equity
Net loss	(375,014)
Ending balance (in shares) at Sep. 30, 2021		172,242,798
Ending balance at Sep. 30, 2021	3,457,590	$ 1,723	5,876,644	133	(2,420,910)
Beginning balance (in shares) at Mar. 31, 2021		171,293,312
Beginning balance at Mar. 31, 2021	3,648,995	$ 1,714	5,723,977	364	(2,077,060)
Increase (Decrease) in Stockholders' Equity
Settlement of convertible notes, net of tax (in shares)		197
Settlement of convertible notes, net of tax	14		14
Exercise of common stock options (in shares)		140,478
Exercise of common stock options	2,858	$ 1	2,857
Compensation expense related to issuance of stock options and restricted stock awards (in shares)		121,575
Compensation expense related to issuance of stock options and restricted stock awards	56,285	$ 2	56,283
Issuance of common stock for business combinations, net of issuance costs (in shares)		126,026
Issuance of common stock for business combinations, net of issuance costs	16,120	$ 1	16,119
Purchase of employee stock purchase plan shares (in shares)		173,717
Purchase of employee stock purchase plan shares	12,038	$ 2	12,036
Net loss	(176,912)				(176,912)
Other comprehensive income (loss)	(297)			(297)
Ending balance (in shares) at Jun. 30, 2021		171,855,305
Ending balance at Jun. 30, 2021	3,559,101	$ 1,720	5,811,286	67	(2,253,972)
Increase (Decrease) in Stockholders' Equity
Settlement of convertible notes, net of tax (in shares)		39
Settlement of convertible notes, net of tax	3		3
Exercise of common stock options (in shares)		100,474
Exercise of common stock options	1,755	$ 1	1,754
Compensation expense related to issuance of stock options and restricted stock awards (in shares)		286,980
Compensation expense related to issuance of stock options and restricted stock awards	63,603	$ 2	63,601
Net loss	(166,938)				(166,938)
Other comprehensive income (loss)	66			66
Ending balance (in shares) at Sep. 30, 2021		172,242,798
Ending balance at Sep. 30, 2021	$ 3,457,590	$ 1,723	5,876,644	133	(2,420,910)
Beginning balance (in shares) at Dec. 31, 2021	173,674,067	173,674,067
Beginning balance at Dec. 31, 2021	$ 3,387,636	$ 1,738	6,028,861	(1,443)	(2,641,520)
Increase (Decrease) in Stockholders' Equity
Exercise of common stock options (in shares)		485,537
Exercise of common stock options	4,282	$ 5	4,277
Compensation expense related to issuance of stock options and restricted stock awards (in shares)		1,391,797
Compensation expense related to issuance of stock options and restricted stock awards	52,441	$ 14	52,427
Other (in shares)		7
Other	(7)		(7)
Net loss	(180,937)				(180,937)
Other comprehensive income (loss)	(5,204)			(5,204)
Ending balance (in shares) at Mar. 31, 2022		175,551,408
Ending balance at Mar. 31, 2022	$ 3,258,211	$ 1,757	6,085,558	(6,647)	(2,822,457)
Beginning balance (in shares) at Dec. 31, 2021	173,674,067	173,674,067
Beginning balance at Dec. 31, 2021	$ 3,387,636	$ 1,738	6,028,861	(1,443)	(2,641,520)
Increase (Decrease) in Stockholders' Equity
Net loss	$ (495,761)
Ending balance (in shares) at Sep. 30, 2022	177,253,533	177,253,533
Ending balance at Sep. 30, 2022	$ 3,108,634	$ 1,774	6,255,211	(11,070)	(3,137,281)
Beginning balance (in shares) at Mar. 31, 2022		175,551,408
Beginning balance at Mar. 31, 2022	3,258,211	$ 1,757	6,085,558	(6,647)	(2,822,457)
Increase (Decrease) in Stockholders' Equity
Exercise of common stock options (in shares)		84,485
Exercise of common stock options	743	$ 1	742
Issuance of common stock to fund the Company's 401(k) match (in shares)		391,129
Issuance of common stock to fund the Company's 401(k) match	29,202	$ 4	29,198
Compensation expense related to issuance of stock options and restricted stock awards (in shares)		183,095
Compensation expense related to issuance of stock options and restricted stock awards	58,932	$ 2	58,930
Issuance of common stock for business combinations, net of issuance costs (in shares)		265,186
Issuance of common stock for business combinations, net of issuance costs	14,790	$ 2	14,788
Purchase of employee stock purchase plan shares (in shares)		326,131
Purchase of employee stock purchase plan shares	15,529	$ 3	15,526
Net loss	(166,063)				(166,063)
Other comprehensive income (loss)	(1,998)			(1,998)
Ending balance (in shares) at Jun. 30, 2022		176,801,434
Ending balance at Jun. 30, 2022	3,209,346	$ 1,769	6,204,742	(8,645)	(2,988,520)
Increase (Decrease) in Stockholders' Equity
Exercise of common stock options (in shares)		73,441
Exercise of common stock options	941	$ 1	940
Compensation expense related to issuance of stock options and restricted stock awards (in shares)		378,658
Compensation expense related to issuance of stock options and restricted stock awards	49,533	$ 4	49,529
Net loss	(148,761)				(148,761)
Other comprehensive income (loss)	$ (2,425)			(2,425)
Ending balance (in shares) at Sep. 30, 2022	177,253,533	177,253,533
Ending balance at Sep. 30, 2022	$ 3,108,634	$ 1,774	$ 6,255,211	$ (11,070)	$ (3,137,281)