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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of antidilutive securities
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
—

 
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