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Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Basic and Diluted Net Loss Per Share A reconciliation of the numerators and denominators used in computing net loss from continuing operations per share is as follows (in thousands, except per share amounts):
Three Months Ended June 30,Six Months Ended June 30,
2019201820192018
Numerator:
Net loss from continuing operations$(37,763)$(28,839)$(72,965)$(59,019)
Denominator:
Shares used in per share calculation42,458 35,355 42,348 35,099 
Net loss from continuing operations per share, basic and diluted$(0.89)$(0.82)$(1.72)$(1.68)
Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss per Share
The following table presents the potential shares of common stock outstanding that were excluded from the computation of diluted net loss from continuing operations per share for the periods presented because including them would have been anti-dilutive (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2019201820192018
Shares subject to outstanding common stock options4,227 3,816 3,973 3,648 
Shares subject to outstanding restricted stock units415 292 355 279 
Shares subject to outstanding warrants to purchase common stock28 38 28 38 
Total4,670 4,146 4,356 3,965