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Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Loss Per Share The following table sets forth the computation of basic and diluted net loss per share (in thousands, except share and per-share data):
 Three Months Ended March 31,
 20212020
Numerator:
Net loss attributable to common stockholders$(24,597)$(19,620)
Denominator:
Weighted-average common shares and pre-funded warrants outstanding—basic and diluted110,742,150 94,723,513 
Net loss per share attributable to common stockholders —basic and diluted$(0.22)$(0.21)
Schedule of Potential Common Shares Issuable Upon Conversion of Warrants Potential dilutive common share equivalents consist of the following:
 March 31,
 20212020
Stock options to purchase common stock10,187,394 7,745,936 
Unvested restricted stock units544,313 170,313 
Warrants to purchase common stock12,378,016 23,084,120 
Total23,109,723 31,000,369