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Stockholders' Equity (Details Textual) - Equity Component [Domain] - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2015
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Class of Stock [Line Items]              
Stock Issued During Period, Value, New Issues         $ 17,491,000    
Warrants Authorized For Issuance To Acquire Common Stock Shares Number   20,313          
Common Stock, Shares Authorized     62,500,000   62,500,000    
Preferred Stock, Shares Authorized     2,000,000   2,000,000    
Share-Based Compensation         $ 355,000 $ 162,000  
Proceeds From Issuance Or Sale Of Equity         $ 16,279,000 5,796,000  
Stock Issued During Period Par Value Exercise Of Options         $ 2.20    
Proceeds from Stock Options Exercised         $ 285,000 0  
Registered Direct Offering [Member]              
Class of Stock [Line Items]              
Stock Issued During Period, Value, New Issues   $ 6,500,000          
Exercise Price Of Warrants   $ 10.00          
Warrants Authorized For Issuance To Acquire Common Stock Value   $ 92,000          
Stock Issued In Registered Direct Offering Price Per Share   $ 8.00          
Placement Agent Fees   $ 488,000          
Payments for Placement Agent Legal Fees   75,000          
Other Cost and Expense, Operating   $ 44,000          
Stock Issued During Period, Shares, Registered Direct Offering   812,500          
Proceeds From Issuance Or Sale Of Equity   $ 5,800,000          
Payment of Financing and Stock Issuance Costs   800,000          
Underwritten Public Offering [Member]              
Class of Stock [Line Items]              
Stock Issued During Period, Value, New Issues $ 17,500,000            
Other Cost and Expense, Operating 110,000            
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     115,087   115,087    
Shares Reserved Unissued     96,837   96,837    
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.    
Equity Incentive Plan [Member]              
Class of Stock [Line Items]              
Common Stock, Shares Authorized 23,034            
Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Share Minimum         85.00%    
Common Stock, Capital Shares Reserved for Future Issuance     1,389,297   1,389,297    
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     817,790   817,790   643,817
Declining Repurchase Rights Per Share     $ 20,000   $ 20,000   $ 28,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 1,433,000   $ 1,433,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         200,894   190,424
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 5.97            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         10 years    
Share-Based Compensation     $ 276,000 $ 81,000 $ 417,000 $ 162,000  
Shares Reserved Unissued     370,613   370,613    
Selling, General and Administrative Expense, Total     $ 37,000   $ 62,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         2 years 1 month 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number     290,651   290,651   441,958
Stock Granted During Period, Value, Share-Based Compensation, Gross         $ 1,232,000    
Allocated Share-based Compensation Expense         $ 230,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 years    
Share Based Compensation Arrangement by Share Based Payment Award Options Grants In Period Fair Value $ 138,000            
Stock Issued During Period Value One Stock Options Exercised         $ 210    
Stock Issued During Period Shares One Stock Options Exercised         4.88    
Stock Issued During Period Par Value Exercise Of Options         $ 2.20    
Proceeds from Stock Options Exercised         $ 285,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         129,062    
Equity Incentive Plan [Member] | Minimum [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         $ 5.07    
Equity Incentive Plan [Member] | Maximum [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         $ 5.97    
Equity Incentive Plan [Member] | Subsequent Event [Member]              
Class of Stock [Line Items]              
Declining Repurchase Rights Value     $ 0.0001   $ 0.0001    
Selling, General and Administrative Expense, Total         $ 76,000    
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         5,837    
Investment Options, Exercise Price         $ 4.88    
Equity Incentive Plan [Member] | Chief Executive Officer [Member]              
Class of Stock [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         300,000    
Stock Granted During Period, Value, Share-Based Compensation, Gross         $ 923,000    
Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Minimum [Member]              
Class of Stock [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         1 year    
Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Maximum [Member]              
Class of Stock [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         2 years    
Equity Incentive Plan [Member] | Employees and Consultant [Member]              
Class of Stock [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         405,200    
Legal Fees [Member] | Registered Direct Offering [Member]              
Class of Stock [Line Items]              
Stock Issued During Period, Value, Issued for Noncash Considerations   $ 113,000