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Stock Option and Equity Incentive Plans - Plan Information (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
item
shares
Dec. 31, 2014
shares
Options    
Stock Option and Equity Incentive Plans    
Options granted (in shares) 18,844  
Options outstanding (in shares) 270,205 340,107
Incentive Plan    
Stock Option and Equity Incentive Plans    
Maximum number of shares issuable 2,250,000  
Amount of limitation on deductibility under Section 162(m) of Internal Revenue Code (in dollars) | $ $ 1,000,000  
Number of types of equity awards | item 2  
Shares of common stock issued since inception 1,178,449  
Additional shares reserved 40,645  
Shares or options available for future issuance 882,156  
Incentive Plan | Options    
Stock Option and Equity Incentive Plans    
Options outstanding (in shares) 105,000  
Options granted since inception (in shares) 170,000  
Non-Employee Director Stock Incentive Plan    
Stock Option and Equity Incentive Plans    
Maximum number of shares issuable 975,000  
Shares of common stock issued since inception 5,647  
Shares or options available for future issuance 153,202  
Non-Employee Director Stock Incentive Plan | Options    
Stock Option and Equity Incentive Plans    
Options granted (in shares) 308,626  
Options outstanding (in shares) 165,205