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Unaudited Quarterly Financial data and Restatement of Previously Issued Unaudited interim Condensed Consolidated Financial Statements - Condensed Consolidated Statements of Stockholders' Equity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity
Balance	$ 586,265	$ 234,560	$ 104,392	$ 129,904	$ (19,225)	$ (15,795)	$ (7,075)	$ (3,588)	$ 70,229
Balance (in shares)				318,637,560
Balance	$ 1,466,919	586,265	234,560	$ 104,392	$ 129,904	(19,225)	(15,795)	(7,075)	(3,588)
Balance (in shares)	473,977,469				318,637,560
As previously Reported
Increase (Decrease) in Stockholders' Equity
Balance	$ 617,444	239,965	109,120	134,679	$ (14,406)	(10,655)	(1,180)	2,713	73,646
Balance		617,444	239,965	109,120	134,679	(14,406)	(10,655)	(1,180)	2,713
Restatement Adjustments
Increase (Decrease) in Stockholders' Equity
Balance	(31,179)	(5,405)	(4,728)	(4,775)	(4,819)	(5,140)	(5,895)	(6,301)	(3,417)
Balance		(31,179)	(5,405)	(4,728)	(4,775)	(4,819)	(5,140)	(5,895)	(6,301)
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance	$ 4,061	$ 3,482	$ 3,222	$ 3,186	$ 2,540	$ 2,470	$ 2,445	$ 2,342	$ 2,291
Balance (in shares)	406,123,816	348,201,792	322,220,469	318,637,560	253,982,578	246,975,173	244,537,235	234,160,661	229,073,517
Balance	$ 4,740	$ 4,061	$ 3,482	$ 3,222	$ 3,186	$ 2,540	$ 2,470	$ 2,445	$ 2,342
Balance (in shares)	473,977,469	406,123,816	348,201,792	322,220,469	318,637,560	253,982,578	246,975,173	244,537,235	234,160,661
Common Stock | As previously Reported
Increase (Decrease) in Stockholders' Equity
Balance	$ 4,061	$ 3,482	$ 3,222	$ 3,186	$ 2,540	$ 2,470	$ 2,445	$ 2,342	$ 2,291
Balance (in shares)	406,123,816	348,201,792	322,220,469	318,637,560	253,982,578	246,975,173	244,537,235	234,160,661	229,073,517
Balance		$ 4,061	$ 3,482	$ 3,222	$ 3,186	$ 2,540	$ 2,470	$ 2,445	$ 2,342
Balance (in shares)		406,123,816	348,201,792	322,220,469	318,637,560	253,982,578	246,975,173	244,537,235	234,160,661
Additional Paid-in-Capital
Increase (Decrease) in Stockholders' Equity
Balance	$ 2,083,169	$ 1,658,438	$ 1,519,094	$ 1,506,953	$ 1,340,781	$ 1,325,381	$ 1,316,815	$ 1,289,636	$ 1,250,899
Balance	3,446,650	2,083,169	1,658,438	1,519,094	1,506,953	1,340,781	1,325,381	1,316,815	1,289,636
Additional Paid-in-Capital | As previously Reported
Increase (Decrease) in Stockholders' Equity
Balance	2,083,199	1,658,532	1,519,257	1,507,116	1,340,859	1,325,459	1,316,893	1,289,714	1,250,899
Balance		2,083,199	1,658,532	1,519,257	1,507,116	1,340,859	1,325,459	1,316,893	1,289,714
Additional Paid-in-Capital | Restatement Adjustments
Increase (Decrease) in Stockholders' Equity
Balance	(30)	(94)	(163)	(163)	(78)	(78)	(78)	(78)
Balance		(30)	(94)	(163)	(163)	(78)	(78)	(78)	(78)
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity
Balance	1,846	1,159	1,052	1,288	929	1,460	1,374	1,584	2,194
Balance	2,451	1,846	1,159	1,052	1,288	929	1,460	1,374	1,584
Accumulated Other Comprehensive Income | As previously Reported
Increase (Decrease) in Stockholders' Equity
Balance	1,958	1,271	1,164	1,400	929	1,460	1,374	1,584	2,194
Balance		1,958	1,271	1,164	1,400	929	1,460	1,374	1,584
Accumulated Other Comprehensive Income | Restatement Adjustments
Increase (Decrease) in Stockholders' Equity
Balance	(112)	(112)	(112)	(112)
Balance		(112)	(112)	(112)	(112)
Treasury Stock
Increase (Decrease) in Stockholders' Equity
Balance	$ (40,434)	$ (31,359)	$ (31,224)	$ (31,216)	$ (31,216)	$ (30,681)	$ (30,637)	$ (30,637)	$ (3,102)
Balance (in shares)	15,926,068	15,292,591	15,261,007	15,259,045	15,259,045	15,020,437	15,002,663	15,002,663	587,151
Balance	$ (40,434)	$ (40,434)	$ (31,359)	$ (31,224)	$ (31,216)	$ (31,216)	$ (30,681)	$ (30,637)	$ (30,637)
Balance (in shares)	15,926,068	15,926,068	15,292,591	15,261,007	15,259,045	15,259,045	15,020,437	15,002,663	15,002,663
Treasury Stock | As previously Reported
Increase (Decrease) in Stockholders' Equity
Balance	$ (40,434)	$ (31,359)	$ (31,224)	$ (31,216)	$ (31,216)	$ (30,681)	$ (30,637)	$ (30,637)	$ (3,102)
Balance (in shares)	15,926,068	15,292,591	15,261,007	15,259,045	15,259,045	15,020,437	15,002,663	15,002,663	587,151
Balance		$ (40,434)	$ (31,359)	$ (31,224)	$ (31,216)	$ (31,216)	$ (30,681)	$ (30,637)	$ (30,637)
Balance (in shares)		15,926,068	15,292,591	15,261,007	15,259,045	15,259,045	15,020,437	15,002,663	15,002,663
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity
Balance	$ (1,462,377)	$ (1,397,160)	$ (1,387,752)	$ (1,350,307)	$ (1,332,259)	$ (1,314,425)	$ (1,297,072)	$ (1,266,513)	$ (1,182,053)
Balance	(1,946,488)	(1,462,377)	(1,397,160)	(1,387,752)	(1,350,307)	(1,332,259)	(1,314,425)	(1,297,072)	(1,266,513)
Accumulated Deficit | As previously Reported
Increase (Decrease) in Stockholders' Equity
Balance	(1,431,340)	(1,391,961)	(1,383,299)	(1,345,807)	(1,327,518)	(1,309,363)	(1,291,255)	(1,260,290)	(1,178,636)
Balance		(1,431,340)	(1,391,961)	(1,383,299)	(1,345,807)	(1,327,518)	(1,309,363)	(1,291,255)	(1,260,290)
Accumulated Deficit | Restatement Adjustments
Increase (Decrease) in Stockholders' Equity
Balance	$ (31,037)	(5,199)	(4,453)	(4,500)	(4,741)	(5,062)	(5,817)	(6,223)	(3,417)
Balance		$ (31,037)	$ (5,199)	$ (4,453)	$ (4,500)	$ (4,741)	$ (5,062)	$ (5,817)	$ (6,223)

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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