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Net Loss Per Share
9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Net Loss Per Share Net Loss Per Share
    Net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding. Outstanding stock options, restricted stock units, and warrants have not been included in the calculation of diluted net loss per share because to do so would be anti-dilutive. Accordingly, the numerator and the denominator used in computing both basic and diluted net loss per share for each period are the same.
    The following shares underlying outstanding options, restricted stock units, and warrants were excluded from the computation of basic and diluted net loss per share for the periods presented (in thousands):
Three Months Ended
September 30,
Nine Months Ended September 30, 2020
 2020201920202019
Options to purchase common stock3,196 4,448 3,546 4,682 
Restricted stock units1,624 1,864 1,552 1,675 
Common stock warrants479 1,231 518 1,052 
Stock appreciation rights14 — —