CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Common Stock 3.75% Convertible Senior Notes	Common Stock 5.5% Convertible Senior Notes	Common Stock Private placement	Common Stock	Additional Paid-in-Capital 3.75% Convertible Senior Notes	Additional Paid-in-Capital 5.5% Convertible Senior Notes	Additional Paid-in-Capital Private placement	Additional Paid-in-Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Accumulated Deficit	3.75% Convertible Senior Notes	5.5% Convertible Senior Notes	Private placement	Total
Balance at Dec. 31, 2018				$ 2,342				$ 1,289,636	$ 1,584	$ (30,637)	$ (1,266,513)				$ (3,588)
Balance (in shares) at Dec. 31, 2018				234,160,661						15,002,663
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company											(83,743)				(83,743)
Other comprehensive (loss) gain									(296)						(296)
Stock-based compensation				$ 19				10,871							10,890
Stock-based compensation (in shares)				1,876,503
Stock dividend								52			(52)
Stock dividend (in shares)				19,286
Issuance of common stock, net				$ 622				157,722							158,344
Issuance of common stock, net (in shares)				62,333,585
Stock option exercises				$ 12				1,784		$ (579)					1,217
Stock option exercises (in shares)				1,151,307						256,382
Exercise of warrants				$ 53				14,099							14,152
Exercise of warrants (in shares)				5,250,750
Provision for common stock warrants								6,513							6,513
Accretion of discount, preferred stock								(1,978)							(1,978)
Conversion of preferred stock				$ 138				28,254							28,392
Conversion of preferred stock (in shares)				13,845,468
Balance at Dec. 31, 2019				$ 3,186				1,506,953	1,288	$ (31,216)	(1,350,307)				129,904
Balance (in shares) at Dec. 31, 2019				318,637,560						15,259,045
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company											(596,155)				(596,155)
Other comprehensive (loss) gain									1,163						1,163
Stock-based compensation				$ 4				17,131							17,135
Stock-based compensation (in shares)				439,649
Stock dividend								26			(26)
Stock dividend (in shares)				5,156
Issuance of common stock, net				$ 790				1,270,872							1,271,662
Issuance of common stock, net (in shares)				78,976,250
Stock option exercises				$ 181				41,060		$ (9,218)					32,023
Stock option exercises (in shares)				18,056,200						667,023
Equity component of 3.75% Convertible Senior Notes issued, net of issuance costs and income tax expense								100,761							100,761
Purchase of capped calls								(16,253)							(16,253)
Termination of capped calls								24,158							24,158
Exercise of warrants				$ 52				(52)
Exercise of warrants (in shares)				5,180,457
Provision for common stock warrants								439,915							439,915
Accretion of discount, preferred stock								(29)							(29)
Conversion of preferred stock				$ 30				1,149							1,179
Conversion of preferred stock (in shares)				2,998,526
Conversion of Convertible Senior Notes				$ 306				62,247							62,553
Conversion of Convertible Senior Notes (in shares)				30,615,615
Repurchase of 5.5% Convertible Senior Notes, net of income tax benefit				$ 94				(50,864)							(50,770)
Repurchase of 5.5% Convertible Senior Notes, net of income tax benefit (in shares)				9,409,591
Common stock issued for acquisitions				$ 97				49,576							49,673
Common stock issued for acquisitions (in shares)				9,658,465
Balance at Dec. 31, 2020				$ 4,740				3,446,650	2,451	$ (40,434)	(1,946,488)				$ 1,466,919
Balance (in shares) at Dec. 31, 2020				473,977,469						15,926,068					473,977,469
Increase (Decrease) in Stockholders' Equity
Issuance of common stock, net (in shares)															32.2
Balance at Dec. 31, 2020				$ 4,740				3,446,650	2,451	$ (40,434)	(1,946,488)				$ 1,466,919
Balance (in shares) at Dec. 31, 2020				473,977,469						15,926,068					473,977,469
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company											(459,965)				$ (459,965)
Other comprehensive (loss) gain									(3,983)						(3,983)
Stock-based compensation				$ 1				76,469							76,470
Stock-based compensation (in shares)				100,662
Issuance of common stock, net			$ 549	$ 322			$ 1,564,065	2,022,897						$ 1,564,614	2,023,219
Issuance of common stock, net (in shares)			54,966,188	32,200,000
Stock option exercises				$ 51				7,469							7,520
Stock option exercises (in shares)				5,097,667
Stock exchanged for tax withholding										$ (32,092)					(32,092)
Stock exchanged for tax withholding (in shares)										1,148,642
Exercise of warrants				$ 242				15,203							15,445
Exercise of warrants (in shares)				24,210,984
Provision for common stock warrants								6,142							6,142
Conversion of Convertible Senior Notes	$ 30	$ 1			$ 15,155	$ 159						$ 15,185	$ 160
Conversion of Convertible Senior Notes (in shares)	3,016,036	69,808
Common stock issued for acquisitions				$ 11				46,686							46,697
Common stock issued for acquisitions (in shares)				1,090,796
Balance (ASU 2020-06) at Dec. 31, 2021								(130,185)			9,550				(120,635)
Balance at Dec. 31, 2021				$ 5,947				$ 7,070,710	$ (1,532)	$ (72,526)	$ (2,396,903)				$ 4,605,696
Balance (in shares) at Dec. 31, 2021				594,729,610						17,074,710					594,729,610