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Net Loss per Share
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Net Loss per Share Net Loss per Share The following table sets forth the calculation of basic and diluted net loss per share for the periods presented (in thousands, except per share amounts):    
Three Months Ended March 31,
 20212020
Numerator:
Net loss$(6,149)$(7,475)
Denominator:
Weighted-average shares, basic 40,048 37,846 
Weighted-average shares, diluted40,048 37,846 
Net loss per share:
Basic$(0.15)$(0.20)
Diluted$(0.15)$(0.20)

The following potentially dilutive shares of restricted stock awards and units, employee stock purchase plan, and stock options were not included in the calculation of diluted shares above as the effect would have been anti‑dilutive (in thousands):
Three Months Ended March 31,
 20212020
Restricted stock units and awards2,433 2,460 
Employee stock purchase plan7 — 
Common stock options2,904 3,859 
 5,344 6,319