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Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended			12 Months Ended
Stockholders' Equity (Details Textual) - USD ($)	Feb. 28, 2017	Jan. 25, 2017	Feb. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2011	Jan. 02, 2011
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues					$ 17,491,000
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				$ 675,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				20,000	26,000
Proceeds From Issuance Or Sale Of Equity				$ 0	$ 16,279,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 173,000
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
Subsequent Event [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	219,444
Subsequent Event [Member] \| Right Offering [Member]
Class of Stock [Line Items]
Warrants Authorized For Issuance To Acquire Common Stock Shares Number		2,395,471
Proceeds From Issuance Or Sale Of Equity		$ 8,700,000
Stock Issued During Period, Shares, Other		2,395,471
Shares Issued, Price Per Share		$ 4.00
Employee Stock Option [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				171,900
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				$ 419,000
Allocated Share-based Compensation Expense				$ 397,000	$ 579,000
Stock Issued During Period, Shares, Other				60,883	40,371
Shares Issued, Price Per Share				$ 2.20
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				4.22
Employee Stock Option [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				4.21
Shares Issued, Price Per Share					$ 2.20
Employee Stock Option [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				$ 4.85
Shares Issued, Price Per Share					$ 5.21
Consultant Plan [Member]
Class of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				116,883
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				10,000	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 3.96
Consultant Plan Expenses				$ 44,000	$ 20,000
Consultant Plan [Member] \| Employee Stock Option [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				1,242,000
Consultant Plan One [Member] \| Employee Stock Option [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				923,000
Warrant [Member]
Class of Stock [Line Items]
Warrants Authorized For Issuance To Acquire Common Stock Shares Number				2,395,471
Exercise Price Of Warrants				$ 4.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 0	$ 0
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				1,407,269
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				171,900	409,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 3.40	$ 5.97
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				$ 150,000	$ 137,000
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period				44,112	23,034
Equity Incentive Plan [Member] \| Employee Stock Option [Member]
Class of Stock [Line Items]
Allocated Share-based Compensation Expense				$ 78,000
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
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					5.39
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
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