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Basic and Diluted Net Loss per Common Share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Basic and Diluted Net Loss per Common Share 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:
 Three Months Ended June 30,Six Months Ended June 30,
(in thousands, except per share amounts) 2021202020212020
Numerator:  
Net loss attributable to common stockholders$(51,225)$(52,492)$(116,889)$(141,440)
Denominator:
Weighted average common shares outstanding — basic and diluted266,398,516 257,973,329 265,384,865 257,548,623 
Dilutive common stock equivalents would include the dilutive effect of common stock options, convertible debt units, RSUs, and warrants for common stock equivalents. Potentially dilutive common stock equivalents were excluded from the diluted earnings per share denominator for all periods because of their anti-dilutive effect.
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:
 As of June 30,
(in thousands) 20212020
Options to purchase common stock14,962 18,414 
Convertible notes458 462 
Outstanding warrants, convertible to common stock— 2,555 
Unvested restricted stock units7,412 7,484 
Total number of potentially issuable shares22,832 28,915