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Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net loss attributable to common stockholders	$ (71,401)	$ (64,011)	$ (52,492)	$ (88,948)	$ (89,729)	$ (61,809)	$ (84,551)	$ (120,299)	$ (276,852)	$ (356,388)	$ (348,995)
Denominator:
Weighted-average common shares outstanding - basic and diluted (in shares)									258,867,380	240,421,001	185,790,021
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									24,129,000	25,533,000	63,029,000
Options to purchase common stock
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									14,032,000	16,724,000	15,810,000
Convertible notes
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									462,000	462,000	40,850,000
Outstanding warrants, convertible to common stock
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									2,555,000	2,555,000	2,657,000
Unvested restricted stock units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									7,080,000	5,792,000	3,712,000

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