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Stockholders' Equity (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted Average Exercise Price, Outstanding, Beginning $ 3.89 $ 3.57
Weighted Average Exercise Price, Grants 5.85 6.98
Weighted Average Exercise Price, Terminations 5.58 6.16
Weighted Average Exercise Price, Exercises 4.13 5.59
Weighted Average Exercise Price, Outstanding, Ending 4.54 $ 3.89
Weighted average exercise price, Vested 2.64  
Weighted average exercise price, Vested and expected to vest $ 4.54  
Aggregate Intrinsic Value, Outstanding, Beginning [1] $ 517,000 $ 945,000
Aggregate Intrinsic Value, Outstanding, Ending [1] 718,000 $ 517,000
Aggregate Intrinsic Value, Vested [1] 621,000  
Aggregate Intrinsic Value, Vested and expected to vest [1] $ 718,000  
2000 Plan [Member] | Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Balance, Outstanding, Beginning 126,500 131,500
Grants
Terminations (5,000) (5,000)
Exercises (3,000)
Balance, Outstanding, Ending 118,500 126,500
Vested 118,500  
Vested and expected to vest 118,500  
Reserved for future grants  
2010 Plan [Member] | Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Balance, Outstanding, Beginning 124,500 106,500
Grants 138,000 46,000
Terminations (13,000) (12,000)
Exercises (1,000) (16,000)
Balance, Outstanding, Ending 248,500 124,500
Vested 42,500  
Vested and expected to vest 248,500  
Reserved for future grants 30,500  
2017 Plan [Member] | Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Balance, Outstanding, Beginning
Grants
Terminations
Exercises
Balance, Outstanding, Ending
Vested  
Vested and expected to vest  
Reserved for future grants 300,000  
[1] Intrinsic value is the difference between the fair market value as of the date indicated and as of the date of the option grant.