Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net loss attributable to common stockholders	$ (236,568)	$ (250,460)	$ (276,852)
Denominator:
Weighted-average common shares outstanding - basic (in shares)	289,057,198	271,421,986	258,867,380
Weighted-average common shares outstanding - diluted (in shares)	289,057,198	271,421,986	258,867,380
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	28,781,000	22,072,000	24,129,000
Options to purchase common stock
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	19,064,000	14,731,000	14,032,000
Unvested restricted stock units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	9,717,000	7,341,000	7,080,000
Outstanding warrants, convertible to common stock
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	0	0	2,555,000
Convertible notes
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	0	0	462,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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