Shareholders' Equity - Additional Information (Details) - USD ($)				1 Months Ended							12 Months Ended						32 Months Ended
	May. 16, 2015	Apr. 22, 2013	Apr. 18, 2013	Feb. 28, 2015	Oct. 31, 2012	Jan. 31, 2012	Feb. 28, 2011	May. 31, 2010	Jan. 31, 2007	Nov. 30, 2006	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2015	Nov. 16, 2015	Sep. 20, 2013	Oct. 24, 2011	Jan. 31, 2006
Class Of Stock [Line Items]
Proceeds from the common stock private placement				$ 14,500,000	$ 19,359,553	$ 9,271,370	$ 7,460,129	$ 834,455
Sale of common stock and warrants (in shares)				26,650,000	10,000,000	9,489,436	5,219,768
Warrant holder common stock purchase price (in usd per share)						$ 1.41					$ 0.36	$ 0.73	$ 0.93
Number of warrants outstanding increased net of exercises (in shares)				3,666,836	2,823,670							2,949,867
Purchase of common stock (in shares)						4,744,718
Public offering expenses					$ 1,600,000	$ 1,100,000
Common stock, shares authorized (in shares)											249,000,000	149,000,000					249,000,000	249,000,000
Exercise price of warrants (in usd per share)					$ 2.65
Common stock and warrants issued for cash (in usd per share)				$ 0.60
Proceeds from issuance of common stock											$ 9,031	$ 6,360					$ 9,031
Commission rate			3.00%
Listing of shares of common stock in connection with Sales Agreement (in shares)		10,593,220
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
Maximum exercisable period of options if percentage of common stock voting rights held is more than ten percent											5 years
Common stock, shares authorized under the plan (in shares)																			12,000,000	8,000,000	6,000,000
Common stock, shares granted and outstanding (in shares)											10,719,904	9,314,765	10,466,695	10,581,194			10,719,904
Stock options available for issuance (in shares)											4,095,267						4,095,267
Exercise option price (in usd per share)								$ 2.50			$ 0.54	$ 1.28	$ 2.67
Shares purchasable through options granted (in shares)											1,843,000	547,117	862,287
Unrecognized compensation cost related to unvested stock options											$ 1,909,361						$ 1,909,361
Weighted-average remaining requisite service period											14 months
Common stock shares purchasable in private placement per warrant (in shares)					2,823,670						3,666,836						3,666,836
Warrants exercisable period after initial issuance						5 years	5 years	5 years
Adjusted exercise price of warrants (in usd per share)				$ 1.44	$ 1.87	$ 1.87						$ 1.79
Financing expense											$ 88,939	$ 62,683	$ 0	$ 397,294
Warrant Liability											$ 1,958,775	$ 597,719	$ 1,064,810	$ 2,852,880			$ 1,958,775
Warranty Obligations
Class Of Stock [Line Items]
Common stock shares purchasable in private placement per warrant (in shares)												2,949,867
Adjusted exercise price of warrants (in usd per share)												$ 1.79
Chairman Of Companys Scientific Advisory Board
Class Of Stock [Line Items]
Purchase of common stock (in shares)									1,500,000
Exercise option price (in usd per share)									$ 1.10
Affiliate Of Chairman
Class Of Stock [Line Items]
Exercise option price (in usd per share)										$ 1
Shares purchasable through options granted (in shares)										300,000
Board
Class Of Stock [Line Items]
Exercise option price (in usd per share)										$ 1
Shares purchasable through options granted (in shares)										5,933,424
Stock Compensation Plan
Class Of Stock [Line Items]
Common stock, shares granted and outstanding (in shares)											4,636,479						4,636,479
Cantor Fitzgerald & Co.
Class Of Stock [Line Items]
Common stock issued through controlled equity offering (in shares)																	6,946,261
Proceeds from Issuance of common stock																	$ 9,402,383
Additional common stock sales gross											$ 7,081,494						$ 7,081,494
Warrant
Class Of Stock [Line Items]
Warrant exercise term investor relations agreement				60 months	60 months	60 months
Convertible units issued				0.7
Common stock warrants expired (in shares)											4,000						4,000
Common Stock
Class Of Stock [Line Items]
Exercise price of warrants (in usd per share)				$ 0.66
Convertible units issued				1
Common stock issued through controlled equity offering (in shares)											26,650,000	5,084,119	1,862,142
February
Class Of Stock [Line Items]
Proceeds from the common stock private placement							$ 2,476,790
Common stock shares purchasable in private placement per warrant (in shares)				18,655,000
Dividend yield rate				0.00%							0.00%
Expected volatility rate				97.00%							91.00%
Risk-free interest rate				1.53%							1.56%
Contractual life											4 years 1 month 10 days
Valuation allowance				$ 4,197,375
Warrant liability carrying value											$ 0						$ 0
Other Income											2,238,600
Warrant Liability											$ 1,958,775						$ 1,958,775
February | Binomial Lattice Simulation
Class Of Stock [Line Items]
Dividend yield rate											0.00%	0.00%
Expected volatility rate											50.00%	148.00%
Risk-free interest rate											0.15%	0.31%
Contractual life											1 month 21 days	1 year 1 month 21 days
Credit to other expense											$ 678,912	$ 268,993
February | Binomial Simulation | Previous Valuation Assumptions
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								5 years
Initial valuation of warrants							$ 2,476,790
February | Warrant
Class Of Stock [Line Items]
Warrant holder common stock purchase price (in usd per share)							$ 2.25
Purchase of common stock (in shares)							2,818,675
May
Class Of Stock [Line Items]
Warrant exercise term private placement								36 months
Dividend yield rate																0.00%
Expected volatility rate																102.00%
Risk-free interest rate																1.375%
Contractual life																36 months
Change in fair value of warrant liability credited to other income													$ 583,134
May | Warranty Obligations
Class Of Stock [Line Items]
Warrant holder common stock purchase price (in usd per share)								$ 1.50
May | Warrant
Class Of Stock [Line Items]
Warrant holder common stock purchase price (in usd per share)								$ 1.50
Purchase of common stock (in shares)								1,245,455
May | Preferred Stock
Class Of Stock [Line Items]
Warrant holder common stock purchase price (in usd per share)	$ 2.50							$ 2.50
Purchase of common stock (in shares)								1,350,000
Common stock shares purchasable in private placement per warrant (in shares)	1,290,996
Proceeds from warrant shares attributed to free standing warrants related party of investor								$ 5,710,500
May | Preferred Stock | Binomial Lattice Simulation
Class Of Stock [Line Items]
Dividend yield rate												0.00%
Expected volatility rate												106.00%
Risk-free interest rate												0.04%
Contractual life												4 months 4 days
Credit to other expense											$ 7,746	$ 260,781
May | Preferred Stock | 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
January
Class Of Stock [Line Items]
Common stock shares purchasable in private placement per warrant (in shares)											1,418,575						1,418,575
October
Class Of Stock [Line Items]
Purchase of common stock (in shares)					4,500,000
Exercise price of warrants (in usd per share)					$ 2.65
Common stock shares purchasable in private placement per warrant (in shares)											4,446,775						4,446,775
Warrants exercisable period after initial issuance					5 years
Maximum | Warranty Obligations
Class Of Stock [Line Items]
Warrant holder common stock purchase price (in usd per share)								$ 1.00
Maximum | Cantor Fitzgerald & Co.
Class Of Stock [Line Items]
Proceeds from issuance of common stock			$ 25,000,000
Maximum | February
Class Of Stock [Line Items]
Warrant holder common stock purchase price (in usd per share)							$ 1.55
Private Placement
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)				18,655,000
Exercise price of warrants (in usd per share)				$ 0.66
Private Placement | Warrant
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)				2,818,675
Private Placement | Maximum
Class Of Stock [Line Items]
Exercise price of warrants (in usd per share)				$ 0.66