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EARNINGS PER SHARE
 3 Months Ended
Mar. 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 the three months ended March 31, 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):
 
March 31,
 
2017
 
2018
Redeemable convertible preferred stock:
 
 
 
Series A-R
1,857

 
—

Series B-R
2,247

 
—

Series C-R
1,508

 
—

Series D-R
1,396

 
—

Series E-R
795

 
—

Series F-R
1,198

 
—

Series G
—

 
—

Series G’
—

 
—

Common stock options
2,170

 
2,379

Common stock warrants
1,227

 
927

Common stock warrants issuable pursuant to Series G Stock financing
—

 
1,286

Redeemable convertible preferred stock warrants
110

 
—

Restricted stock units
—

 
1,208

Restricted securities units
47

 
—

Convertible promissory notes
2,432

 
—

Common stock issuable pursuant to the ESPP
—

 
36