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Basic and Diluted Net Loss per Common Share
 12 Months Ended
Dec. 31, 2020
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:
Years Ended December 31,
(in thousands, except per share amounts)
202020192018
Numerator:
Net loss attributable to common stockholders$(276,852)$(356,388)$(348,995)
Denominator:
Weighted average common shares outstanding — basic and diluted258,867,380 240,421,001 185,790,021 
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:
Years ended December 31,
(in thousands)202020192018
Options to purchase common stock14,032 16,724 15,810 
Convertible notes462 462 40,850 
Outstanding warrants, convertible to common stock2,555 2,555 2,657 
Unvested restricted stock units7,080 5,792 3,712 
Total number of potentially issuable shares24,129 25,533 63,029