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Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2015
Feb. 28, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Class of Stock [Line Items]                
Common Stock, Shares Authorized     62,500,000          
Preferred Stock, Shares Authorized     2,000,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 10,000              
Share-Based Compensation     $ 168,000 $ 116,000        
Proceeds From Issuance Or Sale Of Equity     $ 0 16,279,000        
Underwritten Public Offering [Member]                
Class of Stock [Line Items]                
Stock Issued During Period, Value, New Issues   $ 17,500,000            
Other Cost and Expense, Operating   108,000            
Proceeds From Issuance Or Sale Of Equity   16,300,000            
Payment of Financing and Stock Issuance Costs   $ 1,200,000            
Stock Issued During Period Shares Underwritten Public Offering   2,990,000            
Stock Issued in Underwritten Public Offering Price Per Share   $ 5.85            
Underwriter Agent fees   $ 1,049,000            
Payments for Underwriter Agent Legal Fees   $ 55,000            
Consultant Plan [Member]                
Class of Stock [Line Items]                
Common Stock, Capital Shares Reserved for Future Issuance     115,869          
Shares Reserved Unissued     90,119          
Stock Option Plan Description     The Consultant Plan provides for quarterly increases in the available number of authorized shares equal to the lesser of 1% of any new shares issued by the Company during the quarter immediately prior to the adjustment date or such lesser amount as the Board of Directors shall determine.          
Share Based Compensation Arrangement by Share Based Payment Award Options Grants In Period Fair Value     $ 40,000          
Consultant Plan Expenses     $ 10,000 0        
Equity Incentive Plan [Member]                
Class of Stock [Line Items]                
Common Stock, Shares Authorized     44,112          
Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Share Minimum     85.00%          
Common Stock, Capital Shares Reserved for Future Issuance     1,397,124          
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage     10.00%          
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan     721,024     723,400    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 754,000          
Declining Repurchase Rights Value     $ 8,000     $ 12,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     224,486     213,458    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.40          
Share-Based Compensation     $ 205,000 $ 141,000        
Shares Reserved Unissued     451,614          
Selling, General and Administrative Expense, Total     $ 37,000          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 8 months 8 days          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number     474,160     257,391    
Share Based Compensation Arrangement by Share Based Payment Award Options Grants In Period Fair Value     $ 150,000          
Equity Incentive Plan [Member] | Scenario, Forecast [Member]                
Class of Stock [Line Items]                
Selling, General and Administrative Expense, Total         $ 113,000      
Equity Incentive Plan [Member] | Subsequent Event [Member]                
Class of Stock [Line Items]                
Declining Repurchase Rights Per Share               $ 0.0001
Equity Incentive Plan [Member] | Employee Stock Option [Member]                
Class of Stock [Line Items]                
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Subject To Repurchase Rights Decline     3,335       7,504  
Investment Options, Exercise Price         $ 4.88      
Equity Incentive Plan [Member] | Employee Stock Option One [Member]                
Class of Stock [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 3.96