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Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss attributable to common stockholders	$ (51,225)	$ (52,492)	$ (116,889)	$ (141,440)
Denominator:
Weighted average common shares outstanding - basic (in shares)	266,398,516	257,973,329	265,384,865	257,548,623
Weighted average number of shares outstanding - diluted (in shares)	266,398,516	257,973,329	265,384,865	257,548,623
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			22,832,000	28,915,000
Options to purchase common stock
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			14,962,000	18,414,000
Convertible notes
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			458,000	462,000
Outstanding warrants, convertible to common stock
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			0	2,555,000
Unvested restricted stock units
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			7,412,000	7,484,000