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Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended			3 Months Ended		6 Months Ended
Stockholders' Equity (Details Textual) - USD ($)	May 31, 2018	Feb. 27, 2018	Aug. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Class of Stock [Line Items]
Common Stock, Shares Authorized				62,500,000			62,500,000
Preferred Stock, Shares Authorized				2,000,000			2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	108,108
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 1.85
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, Vested and Expected to Vest, Exercisable, Number				664,982			664,982		754,989
Stock Issued During Period, Shares, New Issues		12,900,000
General And Administrative Expense Related To Stock Grant						$ 100,000	$ 100,000
Proceeds From Issuance Or Sale Of Equity							11,923,000	$ 8,667,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				$ 186,000
Allocated Share-based Compensation Expense				12,000
Stock Granted, Value, Share-based Compensation, Gross	$ 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding				$ 16,000			$ 16,000
Offering [Member]
Class of Stock [Line Items]
Warrants Authorized For Issuance To Acquire Common Stock Shares Number		5,750,000
Proceeds From Issuance Or Sale Of Equity		$ 11,900,000
Stock Issued During Period, Shares, Other		2.25
Employee Stock Option [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				174,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period1				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Employee Stock Option [Member] \| Minimum [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 1.85
Employee Stock Option [Member] \| Maximum [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 1.90
General and Administrative Expense [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues							54,056
Consultant Plan [Member]
Class of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				199,959			199,959
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 3.50
Shares Reserved Unissued				151,709			151,709
General And Administrative Expense Related To Stock Grant							$ 35,000
Consultant Plan Expenses				$ 8,000	$ 17,000		$ 12,000	$ 24,000
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				61,000	76,000		111,000	219,000
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				2,238,030			2,238,030
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				1,004,835			1,004,835		993,860
Shares Reserved Unissued				702,375			702,375
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period1							2 years 8 months 12 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options				$ 451,000			$ 451,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							2 years 8 months 12 days