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Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2016
Mar. 31, 2016
Feb. 28, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Class of Stock [Line Items]                      
Warrants Authorized For Issuance To Acquire Common Stock Shares Number           118,959          
Common Stock, Shares Authorized       62,500,000   62,500,000          
Preferred Stock, Shares Authorized       2,000,000   2,000,000          
Share-Based Compensation           $ 330,000 $ 355,000        
Proceeds From Issuance Or Sale Of Equity           $ 0 16,279,000        
Stock Issued During Period, Shares, Other           60,883          
Shares Issued, Price Per Share       $ 2.20   $ 2.20          
Sale of Stock, Price Per Share       $ 4.51   4.51          
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                
Subsequent Event [Member]                      
Class of Stock [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 10,000                    
Employee Stock Option [Member]                      
Class of Stock [Line Items]                      
Warrants Authorized For Issuance To Acquire Common Stock Shares Number       118,959              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       169,900              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 4.21              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2       10 years              
Stock Granted During Period, Value, Share-Based Compensation, Gross       $ 414,000              
Allocated Share-based Compensation Expense       $ 26,000              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period1       4 years              
Stock Issued During Period, Shares, Other       60,883              
Shares Issued, Price Per Share       $ 2.20   2.20          
Sale of Stock, Price Per Share       $ 4.51   $ 4.51          
Consultant Plan [Member]                      
Class of Stock [Line Items]                      
Common Stock, Capital Shares Reserved for Future Issuance       116,004   116,004          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 4.85          
Shares Reserved Unissued       87,754   87,754          
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           $ 49,000          
Consultant Plan Expenses       $ 10,000 $ 0 $ 20,000 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       1,398,476   1,398,476          
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       888,050   888,050     723,400    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized       $ 1,000,000   $ 1,000,000          
Declining Repurchase Rights Value       4,000   $ 4,000     $ 12,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           235,514     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       $ 200,000 $ 276,000 $ 405,000 $ 417,000        
Shares Reserved Unissued       274,912   274,912          
Selling, General and Administrative Expense, Total       $ 38,000   $ 75,000          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           2 years 4 months 24 days          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number       495,974   495,974     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               $ 75,000      
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           2,502       7,504  
Investment Options, Exercise Price                   $ 4.88