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Stockholder's Equity, Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan ("ESPP") [Member] - shares
3 Months Ended 9 Months Ended
Jun. 30, 2011
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares reserved for issuance (in shares) 333,333  
Term for employee stock purchase plan   10 years
Offering period of employee stock purchase plan   6 months
Minimum percentage of fair market value of the specified conditions used to determine purchase price of ESPP 85.00%  
Employee stock purchase plan, shares purchased (in shares)   14,542