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Stock-Based Compensation - Plan and Expense Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Stock-Based Compensation          
Common stock reserved for future grants (in shares) 104,239   104,239    
Proceeds from exercise of stock options     $ 3,765    
Maximum          
Stock-Based Compensation          
Number of shares of common stock authorized for issuance 442,750   442,750    
Stock Options          
Stock-Based Compensation          
Outstanding options (in shares) 16,168   16,168   12,168
Compensation cost recognized $ 6,600 $ 5,700 $ 18,400 $ 16,100  
Unrecognized compensation cost $ 39,500   $ 39,500    
Period during which compensation cost is expected to be recognized     3 years    
Exercise of stock options (in shares)     500 0  
Stock Options | Minimum          
Stock-Based Compensation          
Price range of stock award (as a percent)     85.00%    
Period over which options become exercisable     1 year    
Stock Options | Maximum          
Stock-Based Compensation          
Price range of stock award (as a percent)     110.00%    
Expiration period of options granted     7 years    
Period over which options become exercisable     3 years