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Basic and Diluted Net Loss per Common Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Reconciliation of the Numerator and Denominator Used in Computing Basic and Diluted Net Loss Per Common Share
The following table provides a reconciliation of the numerator and denominator used in computing basic and diluted net loss attributable to common stockholders per common share:
Years Ended December 31,
(in thousands, except per share amounts)
202120202019
Numerator:
Net loss attributable to common stockholders$(250,460)$(276,852)$(356,388)
Denominator:
Weighted average common shares outstanding — basic and diluted271,421,986 258,867,380 240,421,001 
Schedule of Potential Shares of Common Stock that were Excluded from the Computation as they were Anti-Dilutive Using the Treasury Stock Method
The table below presents potential shares of common stock that were excluded from the computation as they were anti-dilutive using the treasury stock method:
Years ended December 31,
(in thousands)202120202019
Options to purchase common stock14,731 14,032 16,724 
Unvested restricted stock units7,341 7,080 5,792 
Outstanding warrants, convertible to common stock— 2,555 2,555 
Convertible notes— 462 462 
Total number of potentially issuable shares22,072 24,129 25,533