Shareholders' Equity - Additional Information (Details)				1 Months Ended							5 Months Ended	12 Months Ended
	Nov. 18, 2016 shares	Apr. 18, 2014	Apr. 22, 2013 shares	Aug. 31, 2016 USD ($) $ / shares shares	Feb. 28, 2015 USD ($) $ / shares shares	Oct. 31, 2012 $ / shares shares	Jan. 31, 2012 $ / shares shares	Feb. 28, 2011 USD ($) $ / shares shares	May 31, 2010 USD ($) $ / shares shares	Feb. 28, 2005 shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2010	Aug. 12, 2016 $ / shares	Mar. 11, 2016 shares	Jan. 19, 2016 USD ($)	Nov. 16, 2015 shares	Dec. 31, 2013 shares	Apr. 18, 2013 USD ($)
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)	25,000,000										25,000,000	25,000,000	25,000,000	149,000,000					249,000,000
Reverse stock split ratio	0.025
Proceeds from issuance of common stock and warrants, net of offering costs | $												$ 6,345,868	$ 14,599,627	$ 0
Common stock issued through controlled equity offering (in shares)												77,141
Exercise price (in USD per share) | $ / shares					$ 57.60						$ 20.00	$ 20.00
Proceeds from the common stock private placement | $					$ 14,500,000
Price of units issued (in USD per share) | $ / shares					$ 24.00
Common stock reserved | $																		$ 15,081,494
Proceeds from issuance of common stock | $											$ 344	$ 344	$ 225
Maximum public float | $																		$ 75,000,000
Proceeds from issuance of common stock | $												691,187
Recovery of deferred offering costs | $												48,977
Available for sale under agreement | $											$ 14,300,000	$ 14,300,000
Percentage of fair market value of common stock										100.00%
Percentage of common stock voting rights held										10.00%
Minimum percentage of fair market value of common stock										110.00%
Option exercise period										10 years
Common stock, shares authorized under the plan (in shares)										150,000	300,000	300,000
Common stock, shares granted and outstanding (in shares)											162,665	162,665	267,997	232,869						261,667
Restricted shares and units granted (in shares)												6,500
Common stock reserved (in shares)											199,197	199,197					250,000
Shares purchasable through options granted (in shares)												48,444	46,075	13,678
Unrecognized compensation cost related to unvested stock options | $											$ 727,856	$ 727,856
Remaining requisite service period, weighted-average												11 months
Warrants exercisable period after initial issuance							5 years
Common stock shares purchasable in private placement per warrant (in shares)					91,670
Initial valuation of warrants | $								$ 2,476,790
Valuation allowance | $					$ 4,197,375
Closing share price (in USD per share) | $ / shares																$ 2.30
Public offering expenses | $												$ 1,787,787
Stock Compensation Plan
Class Of Stock [Line Items]
Common stock, shares granted and outstanding (in shares)											110,846	110,846
Restricted Stock Units (RSUs)
Class Of Stock [Line Items]
Restricted shares and units granted (in shares)												7,862
Stock options, vesting period												2 years
Employee Stock Option
Class Of Stock [Line Items]
Stock options, vesting period												4 years
Board Of Directors
Class Of Stock [Line Items]
Restricted shares and units granted (in shares)												1,000
January
Class Of Stock [Line Items]
Common stock shares purchasable in private placement per warrant (in shares)											35,454	35,454
October
Class Of Stock [Line Items]
Exercise price (in USD per share) | $ / shares						$ 106.00
Warrants exercisable period after initial issuance						5 years
Common stock shares purchasable in private placement per warrant (in shares)											111,119	111,119
February 2011
Class Of Stock [Line Items]
Other income | $													$ 678,912	$ 268,993
February 2011 | Warranty Obligations
Class Of Stock [Line Items]
Exercise price (in USD per share) | $ / shares								$ 90.00
February 2011 | Previously Reported | Binomial Simulation
Class Of Stock [Line Items]
Dividend yield rate								0.00%					0.00%
Expected volatility rate								146.00%					148.00%
Risk-free interest rate								1.96%					0.31%
Contractual life								5 years					1 year 1 month 21 days
February 2015
Class Of Stock [Line Items]
Dividend yield rate					0.00%								0.00%
Expected volatility rate					97.00%								91.00%
Risk-free interest rate					1.53%								1.56%
Contractual life					5 years								4 years 1 month 10 days
Other income | $													$ 2,238,600
February
Class Of Stock [Line Items]
Proceeds from the common stock private placement | $												$ 76,952
Dividend yield rate												0.00%
Expected volatility rate												89.00%
Risk-free interest rate												1.50%
Contractual life												3 years 1 month 10 days
Other income | $												$ 2,024,611
Cantor Fitzgerald & Co.
Class Of Stock [Line Items]
Common stock reserved | $																					$ 25,000,000
Commission rate		3.00%
Maximum | February 2011
Class Of Stock [Line Items]
Exercise price (in USD per share) | $ / shares								$ 62
Qualified Incentive Stock Options
Class Of Stock [Line Items]
Option exercise period										5 years
Offer and Sale | Cantor Fitzgerald & Co.
Class Of Stock [Line Items]
Proceeds from issuance of common stock | $																					$ 17,000,000
Common Stock
Class Of Stock [Line Items]
Common stock issued through controlled equity offering (in shares)												77,141		127,103
Exercise price (in USD per share) | $ / shares					$ 26.40		$ 56.40				$ 2.05	$ 2.05	$ 14.40	$ 29.20
Convertible units issued (in shares)					1
Warrant
Class Of Stock [Line Items]
Convertible units issued (in shares)					0.7
Warrant exercise term investor relations agreement					5 years
Preferred Stock
Class Of Stock [Line Items]
Proceeds from exercised warrants | $									$ 5,710,500
Preferred Stock | May
Class Of Stock [Line Items]
Exercise price (in USD per share) | $ / shares									$ 100.00
Other income | $													$ 7,746	$ 260,781
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															5 years
Private Placement
Class Of Stock [Line Items]
Common stock issued through controlled equity offering (in shares)					666,250
Amount of common stock purchasable by exercise of warrants (in shares)					466,375	112,500	118,618
Private Placement | Warranty Obligations
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)								70,467
Private Placement | Preferred Stock
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)									33,750
Public Offering
Class Of Stock [Line Items]
Common stock issued through controlled equity offering (in shares)			264,831
2015 Underwritten Public Offering
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)					466,369
Exercise price (in USD per share) | $ / shares					$ 26.40
Maxim Group, LLC
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)				993,115
Proceeds from the common stock private placement | $												$ 496,608
Common stock shares purchasable in private placement per warrant (in shares)											2,284,395	2,284,395
Maxim Group, LLC | Common Stock
Class Of Stock [Line Items]
Exercise price (in USD per share) | $ / shares				$ 6.00
Maxim Group, LLC | Warrant
Class Of Stock [Line Items]
Exercise price (in USD per share) | $ / shares				$ 0.40
Maxim Group, LLC | Underwritten Public Offering
Class Of Stock [Line Items]
Proceeds from issuance of common stock and warrants, net of offering costs | $				$ 6,600,000
Common stock issued through controlled equity offering (in shares)				863,750
Maxim Group, LLC | Underwritten Public Offering | Warrant
Class Of Stock [Line Items]
Exercise price (in USD per share) | $ / shares											$ 0.50	$ 0.50
Maxim Group, LLC | Over-Allotment Option
Class Of Stock [Line Items]
Common stock issued through controlled equity offering (in shares)				37,500
Maxim Group, LLC | Base Warrant
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)				881,250
Exercise price (in USD per share) | $ / shares				$ 7.68
Term of warrants												5 years
Maxim Group, LLC | Pre-funded Warrant
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)				311,250
Exercise price (in USD per share) | $ / shares				$ 0.40
Term of warrants				10 years								10 years
Warrants exercised (in shares)											208,750
Proceeds from exercised warrants | $											$ 83,500
Warrants outstanding (in shares)											102,500	102,500
Maxim Group, LLC | Pre-funded Warrant | Underwritten Public Offering
Class Of Stock [Line Items]
Amount of common stock purchasable by exercise of warrants (in shares)				111,965