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Stockholders' Equity
9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Stockholders' Equity
Stockholders’ Equity
 
Common Stock
 
The Company had reserved shares of common stock for issuance as follows:
 
 
September 30,
2018
 
December 31, 2017
Stock options and restricted stock units issued and outstanding
6,581,890

 
6,061,081

Stock options and restricted stock units available for grant under stock option plans
1,552,554

 
1,133,907

Common stock available for the Employee Stock Purchase Plan
309,419

 
456,002

Total
8,443,863

 
7,650,990