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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Shares of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance are as follows:

 

 

March 31,

 

 

December 31,

 

 

2019

 

 

2018

 

Common stock options issued and outstanding

 

7,346,935

 

 

 

5,019,964

 

Common stock options available for future grant

 

3,699,320

 

 

 

4,492,021

 

Common stock reserved for issuance under ESPP

 

2,103,102

 

 

 

1,642,821

 

Total common stock reserved for future issuance

 

13,149,357

 

 

 

11,154,806