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Common Stock (Tables)
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Stock by Class
Common stock has been reserved for the following potential future issuances:
 
June 30, 2019
 
December 31, 2018
 
(unaudited)

 
 
Shares underlying outstanding stock options
5,677,472

 
7,588,405

Shares underlying unvested restricted stock units
142,217

 

Shares available for issuance under the 2018 Incentive Award Plan
3,358,358

 
3,556,507

Shares available for issuance under the 2018 Employee Stock Purchase Plan
802,548

 
922,250

Total
9,980,595
 
12,067,162