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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
EARNINGS PER SHARE
Diluted net loss per share is the same as basic net loss per share for 2016, 2017 and 2018 because the effects of potentially dilutive items were anti-dilutive, given our net loss during these periods. The following securities have been excluded from the calculation of diluted weighted-average common shares outstanding because the effect is anti-dilutive (in thousands):
 
December 31,
 
2016
 
2017
 
2018
Redeemable convertible preferred stock:
 
 
 
 
 
Series A-R
1,857

 
1,857

 
—

Series B-R
2,247

 
2,247

 
—

Series C-R
1,508

 
1,508

 
—

Series D-R
1,396

 
1,396

 
—

Series E-R
795

 
795

 
—

Series F-R
1,199

 
1,199

 
—

Series G
—

 
346

 
—

Series G’
—

 
1,296

 
—

Common stock options
2,137

 
2,514

 
1,774

Common stock warrants
1,227

 
1,245

 
867

Common stock warrants issuable pursuant to Series G Stock financing
—

 
547

 
—

Redeemable convertible preferred stock warrants
110

 
110

 
—

Restricted stock units
—

 
—

 
381

Restricted securities units
53

 
37

 
—

Convertible promissory notes
2,734

 
—

 
—

Common stock issuable pursuant to the ESPP
—

 
—

 
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