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EARNINGS PER SHARE (Tables)
6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Schedule of antidilutive securities
 
June 30,
 
2019
 
2020
Common stock options
1,620

 
715

Common stock warrants
868

 

Unvested restricted stock units
1,846

 
2,627

Common stock issuable pursuant to the ESPP
22

 
9