Shareholders' Equity (Details Textual) - USD ($)				1 Months Ended					3 Months Ended				6 Months Ended		12 Months Ended
	Mar. 20, 2015	Apr. 22, 2013	Apr. 18, 2013	Feb. 28, 2015	Oct. 31, 2012	Jan. 31, 2012	Feb. 28, 2011	May. 31, 2010	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Sep. 30, 2013	Oct. 24, 2011	Feb. 28, 2005
Class Of Stock [Line Items]
Proceeds from the common stock private placement				$ 14,500,000
Sale of common stock and warrants , shares				26,650,000
Common stock and warrants issued for cash per share				$ 0.60
Common stock aggregate offering price									$ 9,025	$ 6,360			$ 9,025		$ 6,360
Commission rate			3.00%
Common stock issued for cash, shares									0				0
Percentage of fair market value of common stock													not be less than 100%
Percentage of common stock voting rights held													more than 10%
Minimum percentage of fair market value of common stock													less than 110%
Maximum exercisable period of options													10 years
Common stock, shares authorized under the plan																			12,000,000	8,000,000	6,000,000
Stock granted during period, Shares													260,000
Common stock, shares granted and outstanding									10,844,904	9,314,765			10,844,904		9,314,765
Stock options available for issuance									4,045,593				4,045,593
Unrecognized compensation cost related to unvested stock options									$ 2,800,000				$ 2,800,000
Weighted-average remaining requisite service period													16 months
Restricted shares issued by the company	260,000
Shares Issued, Price Per Share	$ 0.58
Warrants exercisable period after initial issuance						5 years	5 years	5 years
Number of warrants outstanding increased net of exercises				3,666,836	2,823,670					2,949,845	2,869,696			2,854,196
Common Stock Shares Purchased Private Placement Warrant					2,823,670				3,666,836	2,949,867			3,666,836		2,949,867
Financing expense					$ 368,524	$ 368,524						$ 24,600	$ 88,939	$ 24,600	$ 62,683
Initial valuation of warrants													2,476,790
Warrant liability carrying value									$ 2,894,871	$ 597,719		$ 1,256,343	2,894,871	$ 1,256,343	$ 597,719			$ 1,064,810
Valuation Allowances and Reserves, Deductions				$ 4,197,375
As Adjusted
Class Of Stock [Line Items]
Exercise price of warrants				$ 1.44	$ 1.87	$ 1.87				$ 1.79	$ 1.84	$ 1.85		$ 1.85	$ 1.79
February 2011
Class Of Stock [Line Items]
Proceeds from the common stock private placement							$ 2,476,790
Other Income									22,001			$ 175,547	656,911
Warrant liability carrying value									$ 22,001				$ 22,001
February 2011 | Warranty Obligations
Class Of Stock [Line Items]
Exercise price of warrants							$ 2.25
February 2011 | Binomial Lattice Simulation
Class Of Stock [Line Items]
Dividend yield rate													0.00%
Expected volatility rate													80.00%
Risk-free interest rate													0.16%
Contractual life													7 months 21 days
February 2011 | Other Expense
Class Of Stock [Line Items]
Charge to other expense														$ 115,293
February 2011 | Scenario, Previously Reported | Binomial Simulation
Class Of Stock [Line Items]
Dividend yield rate																0.00%
Expected volatility rate																146.00%
Risk-free interest rate																1.96%
Contractual life																5 years
January
Class Of Stock [Line Items]
Common Stock Shares Purchased Private Placement Warrant									1,418,575				1,418,575
October
Class Of Stock [Line Items]
Exercise price of warrants					$ 2.65
Warrants exercisable period after initial issuance					5 years
Common Stock Shares Purchased Private Placement Warrant									4,446,775				4,446,775
February 2015
Class Of Stock [Line Items]
Warrants exercisable period after initial issuance				5 years
Common Stock Shares Purchased Private Placement Warrant									18,655,000				18,655,000
Dividend yield rate				0.00%									0.00%
Expected volatility rate				97.00%									91.00%
Risk-free interest rate				1.53%									1.51%
Contractual life				5 years									4 years 7 months 10 days
Other Income									$ 205,205				$ 1,324,505
Warrant liability carrying value									$ 2,872,870				$ 2,872,870
Qualified Incentive Stock Options Granted Owning More Than Ten Percentage Of Combined Voting Power
Class Of Stock [Line Items]
Maximum exercisable period of options													5 years
Stock Compensation Plan
Class Of Stock [Line Items]
Common stock, shares granted and outstanding									4,761,478				4,761,478
Maximum | February 2011
Class Of Stock [Line Items]
Exercise price of warrants							$ 1.55
Cantor Fitzgerald And Company
Class Of Stock [Line Items]
Common stock issued for cash, shares													6,949,261
Proceeds from Issuance of common stock													$ 9,402,383
Additional common stock sales gross									$ 7,081,494				$ 7,081,494
Cantor Fitzgerald And Company | Maximum
Class Of Stock [Line Items]
Common stock aggregate offering price			$ 25,000,000
Cantor Fitzgerald And Company | Offer and Sale
Class Of Stock [Line Items]
Common stock aggregate offering price			$ 17,000,000
Private Placement
Class Of Stock [Line Items]
Purchase of common stock, shares				18,655,000	4,500,000	4,744,718
Private Placement | Warranty Obligations
Class Of Stock [Line Items]
Purchase of common stock, shares							2,818,675
Public Offering
Class Of Stock [Line Items]
Common stock issued for cash, shares		10,593,220
Common Stock
Class Of Stock [Line Items]
Exercise price of warrants				$ 0.66		$ 1.41			$ 0.47	$ 0.73			$ 0.47		$ 0.73
Warrant
Class Of Stock [Line Items]
Warrant exercise term investor relations agreement				60 months
Warrant | February 2011
Class Of Stock [Line Items]
Exercise price of warrants							$ 2.25
Warrant | Private Placement
Class Of Stock [Line Items]
Purchase of common stock, shares							2,609,898
Preferred Stock
Class Of Stock [Line Items]
Exercise price of warrants				$ 2.50
Proceeds from warrant shares attributed to free standing warrants related party of investor								$ 5,710,500
Preferred Stock | May
Class Of Stock [Line Items]
Exercise price of warrants								$ 2.50	$ 2.50				$ 2.50
Common stock warrants expired									1,290,996				1,290,996
Preferred Stock | May | Binomial Simulation
Class Of Stock [Line Items]
Dividend yield rate																	0.00%
Expected volatility rate																	102.00%
Risk-free interest rate																	2.50%
Contractual life																	60 months
Preferred Stock | May | Binomial Lattice Simulation
Class Of Stock [Line Items]
Other Income												$ 73,587
Preferred Stock | May | Binomial Lattice Simulation | Other Expense
Class Of Stock [Line Items]
Charge to other expense														$ 51,640
Preferred Stock | May | Binomial Lattice Simulation | Other Income
Class Of Stock [Line Items]
Charge to other expense									$ 7,746				$ 7,746
Preferred Stock | Private Placement
Class Of Stock [Line Items]
Purchase of common stock, shares								1,350,000