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Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended		12 Months Ended
Stockholders' Equity (Details Textual) - USD ($)	Feb. 28, 2015	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2011
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
Stock Issued During Period, Value, Issued for Noncash Considerations					$ 125,000
Common Stock, Shares Authorized			62,500,000
Preferred Stock, Shares Authorized			2,000,000
Declining Repurchase Rights Per Share					$ 0.0001
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			$ 910,000
Stock Issued In Registered Direct Offering Price Per Share				$ 8.00
Stock Granted During Period, Value, Share-Based Compensation, Gross			26,000	$ 26,000
Proceeds From Issuance Or Sale Of Equity			16,279,000	5,780,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value			381,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options			20,000
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	115,380
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	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
Employee Stock Option [Member]
Class of Stock [Line Items]
Stock Granted During Period, Value, Share-Based Compensation, Gross			1,242,000
Allocated Share-based Compensation Expense			$ 126,000	$ 178,000
Consultant Plan [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			5,000	7,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 3.96	$ 10.26
Stock Granted During Period, Value, Share-Based Compensation, Gross			$ 20,000	$ 72,000
Consultant Plan [Member] \| Employee Stock Option [Member]
Class of Stock [Line Items]
Stock Granted During Period, Value, Share-Based Compensation, Gross			$ 799,000
Warrant [Member]
Class of Stock [Line Items]
Warrants Authorized For Issuance To Acquire Common Stock Shares Number		20,313
Exercise Price Of Warrants		$ 10.00
Warrants Authorized For Issuance To Acquire Common Stock Value		$ 92,000
Equity Incentive Plan [Member]
Class of Stock [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Share Minimum			85.00%
Common Stock, Capital Shares Reserved for Future Issuance			1,392,230
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage			10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			409,200	141,880
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 5.97	$ 10.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			10 years	10 years
Stock Granted During Period, Value, Share-Based Compensation, Gross			$ 137,000	$ 150,000
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period			23,034	14,625
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			4,169	7,504
Investment Options, Exercise Price				$ 4.88
Allocated Share-based Compensation Expense			$ 579,000
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	8.22
Equity Incentive Plan [Member] \| Employee Stock Option Two [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	$ 9.90
Equity Incentive Plan [Member] \| Chief Executive Officer [Member]
Class of Stock [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period			300,000
Equity Incentive Plan [Member] \| Employees and Consultant [Member]
Class of Stock [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period			409,200
Legal Fees [Member] \| Registered Direct Offering [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Issued for Noncash Considerations		$ 113,000
Mr. Pirnat [Member] \| Employee Stock Option [Member]
Class of Stock [Line Items]
Stock Granted During Period, Value, Share-Based Compensation, Gross			$ 923,000