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Net Loss Per Share
 6 Months Ended
Jun. 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
June 30,		Six Months Ended June 30, 2020
 2020201920202019
Options to purchase common stock3,501  4,765  3,724  4,801  
Restricted stock units1,578  1,641  1,515  1,578  
Common stock warrants479  1,013  538  960  
Stock appreciation rights13  —  7  —