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Stockholders' Equity
9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Stockholders' Equity
Stockholders’ Equity
 
Common Stock
 
The Company had reserved shares of common stock for issuance as follows:
 
 
September 30,
2017
 
December 31, 2016
Stock options and restricted stock units issued and outstanding
6,318,932

 
5,251,832

Stock options and restricted stock units available for grant under stock option plans
1,102,427

 
887,724

Common stock available for the Employee Stock Purchase Plan
456,002

 
609,053

Total
7,877,361

 
6,748,609