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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of ESPP Share Activity

The following is a summary of 2009 and 2019 ESPP share activity for the nine months ended September 30, 2019: 

 

 

 

Shares

 

Available for future purchases, January 1, 2019

 

 

183,244

 

Additional shares reserved under 2009 ESPP

 

 

85,162

 

Additional shares reserved under 2019 ESPP

 

 

300,000

 

Purchases

 

 

(102,343

)

Available for future purchases, September 30, 2019

 

 

466,063